21369425084 has 36 divisors (see below), whose sum is σ = 44215216920. Its totient is φ = 9008183520.

The previous prime is 21369425041. The next prime is 21369425089. The reversal of 21369425084 is 48052496312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369425089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 881714 + ... + 905625.

It is an arithmetic number, because the mean of its divisors is an integer number (1228200470).

Almost surely, 2^21369425084 is an apocalyptic number.

It is an amenable number.

21369425084 is an abundant number, since it is smaller than the sum of its proper divisors (22845791836).

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

21369425084 is a wasteful number, since it uses less digits than its factorization.

21369425084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787418 (or 1787409 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 21369425084 in words is "twenty-one billion, three hundred sixty-nine million, four hundred twenty-five thousand, eighty-four".