1221031320102 has 80 divisors (see below), whose sum is σ = 2984978289744. Its totient is φ = 369980352000.

The previous prime is 1221031320079. The next prime is 1221031320199. The reversal of 1221031320102 is 2010231301221.

1221031320102 is a `hidden beast` number, since 1 + 2 + 210 + 31 + 320 + 102 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36409102 + ... + 36442622.

Almost surely, 2^{1221031320102} is an apocalyptic number.

1221031320102 is an abundant number, since it is smaller than the sum of its proper divisors (1763946969642).

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

1221031320102 is a wasteful number, since it uses less digits than its factorization.

1221031320102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53987 (or 53978 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1221031320102 its reverse (2010231301221), we get a palindrome (3231262621323).

The spelling of 1221031320102 in words is "one trillion, two hundred twenty-one billion, thirty-one million, three hundred twenty thousand, one hundred two".