21002121110104 has 16 divisors (see below), whose sum is σ = 40339439937720. Its totient is φ = 10244937126720.

The previous prime is 21002121110099. The next prime is 21002121110197. The reversal of 21002121110104 is 40101112120012.

It is a super-2 number, since 2×21002121110104² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32015428194 + ... + 32015428849.

Almost surely, 2^{21002121110104} is an apocalyptic number.

It is an amenable number.

21002121110104 is a deficient number, since it is larger than the sum of its proper divisors (19337318827616).

21002121110104 is a wasteful number, since it uses less digits than its factorization.

21002121110104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64030857090 (or 64030857086 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21002121110104 its reverse (40101112120012), we get a palindrome (61103233230116).

The spelling of 21002121110104 in words is "twenty-one trillion, two billion, one hundred twenty-one million, one hundred ten thousand, one hundred four".