1220121210220 has 96 divisors (see below), whose sum is σ = 2892018427200. Its totient is φ = 428315059200.

The previous prime is 1220121210211. The next prime is 1220121210229. The reversal of 1220121210220 is 220121210221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1220121210211) and next prime (1220121210229).

It is a junction number, because it is equal to n+sod(n) for n = 1220121210194 and 1220121210203.

It is not an unprimeable number, because it can be changed into a prime (1220121210229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61423090 + ... + 61442950.

It is an arithmetic number, because the mean of its divisors is an integer number (30125191950).

Almost surely, 2^{1220121210220} is an apocalyptic number.

1220121210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220121210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1446009213600).

1220121210220 is an abundant number, since it is smaller than the sum of its proper divisors (1671897216980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220121210220 is a wasteful number, since it uses less digits than its factorization.

1220121210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29539 (or 29537 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1220121210220 its reverse (220121210221), we get a palindrome (1440242420441).

Subtracting from 1220121210220 its reverse (220121210221), we obtain a palindrome (999999999999).

It can be divided in two parts, 1220121 and 210220, that added together give a palindrome (1430341).

The spelling of 1220121210220 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty".