1220211211220 has 24 divisors (see below), whose sum is σ = 2562492508800. Its totient is φ = 488075157792.

The previous prime is 1220211211201. The next prime is 1220211211223. The reversal of 1220211211220 is 221121120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220211211223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542921 + ... + 1653839.

It is an arithmetic number, because the mean of its divisors is an integer number (106770521200).

Almost surely, 2^{1220211211220} is an apocalyptic number.

1220211211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220211211220 is an abundant number, since it is smaller than the sum of its proper divisors (1342281297580).

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

1220211211220 is a wasteful number, since it uses less digits than its factorization.

1220211211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165847 (or 1165845 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1220211211220 its reverse (221121120221), we get a palindrome (1441332331441).

Subtracting from 1220211211220 its reverse (221121120221), we obtain a palindrome (999090090999).

The spelling of 1220211211220 in words is "one trillion, two hundred twenty billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty".