21000002121010 has 16 divisors (see below), whose sum is σ = 41236367801472. Its totient is φ = 7636364407600.

The previous prime is 21000002120947. The next prime is 21000002121071. The reversal of 21000002121010 is 1012120000012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95454554986 + ... + 95454555205.

It is an arithmetic number, because the mean of its divisors is an integer number (2577272987592).

Almost surely, 2^{21000002121010} is an apocalyptic number.

21000002121010 is a deficient number, since it is larger than the sum of its proper divisors (20236365680462).

21000002121010 is a wasteful number, since it uses less digits than its factorization.

21000002121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190909110209.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000002121010 its reverse (1012120000012), we get a palindrome (22012122121022).

The spelling of 21000002121010 in words is "twenty-one trillion, two million, one hundred twenty-one thousand, ten".