21002102021010 has 32 divisors (see below), whose sum is σ = 54987321655872. Its totient is φ = 5091418671680.

The previous prime is 21002102020967. The next prime is 21002102021027. The reversal of 21002102021010 is 1012020120012.

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, 31821366369 + ... + 31821367028.

It is an arithmetic number, because the mean of its divisors is an integer number (1718353801746).

Almost surely, 2^{21002102021010} is an apocalyptic number.

21002102021010 is an abundant number, since it is smaller than the sum of its proper divisors (33985219634862).

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

21002102021010 is a wasteful number, since it uses less digits than its factorization.

21002102021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63642733418.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21002102021010 its reverse (1012020120012), we get a palindrome (22014122141022).

The spelling of 21002102021010 in words is "twenty-one trillion, two billion, one hundred two million, twenty-one thousand, ten".