1220020021220 has 432 divisors, whose sum is σ = 3549004720128. Its totient is φ = 348184811520.

The previous prime is 1220020021123. The next prime is 1220020021279. The reversal of 1220020021220 is 221200200221.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1220020021195 and 1220020021204.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 231368504 + ... + 231373776.

It is an arithmetic number, because the mean of its divisors is an integer number (8215288704).

Almost surely, 2^{1220020021220} is an apocalyptic number.

1220020021220 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 1220020021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1774502360064).

1220020021220 is an abundant number, since it is smaller than the sum of its proper divisors (2328984698908).

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

1220020021220 is a wasteful number, since it uses less digits than its factorization.

1220020021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460 (or 5438 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 1220020021220 its reverse (221200200221), we get a palindrome (1441220221441).

The spelling of 1220020021220 in words is "one trillion, two hundred twenty billion, twenty million, twenty-one thousand, two hundred twenty".