21200021210104 has 16 divisors (see below), whose sum is σ = 43363679748120. Its totient is φ = 9636373277280.

The previous prime is 21200021210051. The next prime is 21200021210113. The reversal of 21200021210104 is 40101212000212.

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, 120454665879 + ... + 120454666054.

Almost surely, 2^{21200021210104} is an apocalyptic number.

It is an amenable number.

21200021210104 is an abundant number, since it is smaller than the sum of its proper divisors (22163658538016).

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

21200021210104 is a wasteful number, since it uses less digits than its factorization.

21200021210104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240909331950 (or 240909331946 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21200021210104 its reverse (40101212000212), we get a palindrome (61301233210316).

The spelling of 21200021210104 in words is "twenty-one trillion, two hundred billion, twenty-one million, two hundred ten thousand, one hundred four".