1021220012120 has 256 divisors, whose sum is σ = 2902401331200. Its totient is φ = 314139893760.

The previous prime is 1021220012069. The next prime is 1021220012149. The reversal of 1021220012120 is 212100221201.

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 = 1021220012095 and 1021220012104.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 83175422 + ... + 83187698.

It is an arithmetic number, because the mean of its divisors is an integer number (11337505200).

Almost surely, 2^{1021220012120} is an apocalyptic number.

1021220012120 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 1021220012120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451200665600).

1021220012120 is an abundant number, since it is smaller than the sum of its proper divisors (1881181319080).

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

1021220012120 is a wasteful number, since it uses less digits than its factorization.

1021220012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12658 (or 12654 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1021220012120 its reverse (212100221201), we get a palindrome (1233320233321).

The spelling of 1021220012120 in words is "one trillion, twenty-one billion, two hundred twenty million, twelve thousand, one hundred twenty".