21002120102002 has 32 divisors (see below), whose sum is σ = 34016176696320. Its totient is φ = 9667679280960.

The previous prime is 21002120101987. The next prime is 21002120102011. The reversal of 21002120102002 is 20020102120012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

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, 34651068 + ... + 35251960.

It is an arithmetic number, because the mean of its divisors is an integer number (1063005521760).

Almost surely, 2^{21002120102002} is an apocalyptic number.

21002120102002 is a deficient number, since it is larger than the sum of its proper divisors (13014056594318).

21002120102002 is a wasteful number, since it uses less digits than its factorization.

21002120102002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604458.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002120102002 its reverse (20020102120012), we get a palindrome (41022222222014).

The spelling of 21002120102002 in words is "twenty-one trillion, two billion, one hundred twenty million, one hundred two thousand, two".