21021420025704 has 128 divisors (see below), whose sum is σ = 61379467776000. Its totient is φ = 5875688242944.

The previous prime is 21021420025657. The next prime is 21021420025709. The reversal of 21021420025704 is 40752002412012.

It is not an unprimeable number, because it can be changed into a prime (21021420025709) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5818914 + ... + 8712209.

It is an arithmetic number, because the mean of its divisors is an integer number (479527092000).

Almost surely, 2^{21021420025704} is an apocalyptic number.

21021420025704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21021420025704 is an abundant number, since it is smaller than the sum of its proper divisors (40358047750296).

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

21021420025704 is a wasteful number, since it uses less digits than its factorization.

21021420025704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14531327 (or 14531323 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

Adding to 21021420025704 its reverse (40752002412012), we get a palindrome (61773422437716).

The spelling of 21021420025704 in words is "twenty-one trillion, twenty-one billion, four hundred twenty million, twenty-five thousand, seven hundred four".