21021210020204 has 12 divisors (see below), whose sum is σ = 36791134976064. Its totient is φ = 10509457169904.

The previous prime is 21021210020177. The next prime is 21021210020207. The reversal of 21021210020204 is 40202001212012.

It is not an unprimeable number, because it can be changed into a prime (21021210020207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286918844 + ... + 286992099.

It is an arithmetic number, because the mean of its divisors is an integer number (3065927914672).

Almost surely, 2^{21021210020204} is an apocalyptic number.

It is an amenable number.

21021210020204 is a deficient number, since it is larger than the sum of its proper divisors (15769924955860).

21021210020204 is a wasteful number, since it uses less digits than its factorization.

21021210020204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573920104 (or 573920102 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21021210020204 its reverse (40202001212012), we get a palindrome (61223211232216).

The spelling of 21021210020204 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, twenty thousand, two hundred four".