21201022202004 has 36 divisors (see below), whose sum is σ = 54499802841120. Its totient is φ = 6947227613520.

The previous prime is 21201022201999. The next prime is 21201022202033. The reversal of 21201022202004 is 40020222010212.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4990822312 + ... + 4990826559.

Almost surely, 2^{21201022202004} is an apocalyptic number.

It is an amenable number.

21201022202004 is an abundant number, since it is smaller than the sum of its proper divisors (33298780639116).

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

21201022202004 is a wasteful number, since it uses less digits than its factorization.

21201022202004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9981648940 (or 9981648935 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21201022202004 its reverse (40020222010212), we get a palindrome (61221244212216).

The spelling of 21201022202004 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred two thousand, four".