1221111020120 has 64 divisors (see below), whose sum is σ = 2775337331040. Its totient is φ = 483497728000.

The previous prime is 1221111020093. The next prime is 1221111020137. The reversal of 1221111020120 is 210201111221.

It is a super-2 number, since 2×1221111020120² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221111020095 and 1221111020104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18919424 + ... + 18983856.

Almost surely, 2^{1221111020120} is an apocalyptic number.

1221111020120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221111020120 is an abundant number, since it is smaller than the sum of its proper divisors (1554226310920).

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

1221111020120 is a wasteful number, since it uses less digits than its factorization.

1221111020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69236 (or 69232 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221111020120 its reverse (210201111221), we get a palindrome (1431312131341).

The spelling of 1221111020120 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, twenty thousand, one hundred twenty".