1221211012120 has 32 divisors (see below), whose sum is σ = 2997517939920. Its totient is φ = 444076731520.

The previous prime is 1221211012111. The next prime is 1221211012157. The reversal of 1221211012120 is 212101121221.

It is a super-2 number, since 2×1221211012120² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221211012094 and 1221211012103.

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 7 ways as a sum of consecutive naturals, for example, 1387739347 + ... + 1387740226.

Almost surely, 2^{1221211012120} is an apocalyptic number.

1221211012120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221211012120 is an abundant number, since it is smaller than the sum of its proper divisors (1776306927800).

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

1221211012120 is a wasteful number, since it uses less digits than its factorization.

1221211012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775479595 (or 2775479591 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221211012120 its reverse (212101121221), we get a palindrome (1433312133341).

The spelling of 1221211012120 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, twelve thousand, one hundred twenty".