1200102000021 has 32 divisors (see below), whose sum is σ = 1952873856000. Its totient is φ = 725004404784.

The previous prime is 1200102000001. The next prime is 1200102000037. The reversal of 1200102000021 is 1200002010021.

It is not a de Polignac number, because 1200102000021 - 2⁵ = 1200101999989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1200101999967 and 1200102000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200102000001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50844291 + ... + 50867888.

It is an arithmetic number, because the mean of its divisors is an integer number (61027308000).

Almost surely, 2^{1200102000021} is an apocalyptic number.

It is an amenable number.

1200102000021 is a deficient number, since it is larger than the sum of its proper divisors (752771855979).

1200102000021 is a wasteful number, since it uses less digits than its factorization.

1200102000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101712230 (or 101712224 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1200102000021 its reverse (1200002010021), we get a palindrome (2400104010042).

The spelling of 1200102000021 in words is "one trillion, two hundred billion, one hundred two million, twenty-one", and thus it is an aban number.