21425318908900 has 72 divisors (see below), whose sum is σ = 47187110776064. Its totient is φ = 8442455558400.

The previous prime is 21425318908897. The next prime is 21425318908907. The reversal of 21425318908900 is 980981352412.

It is not an unprimeable number, because it can be changed into a prime (21425318908907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4224805 + ... + 7790995.

Almost surely, 2^{21425318908900} is an apocalyptic number.

21425318908900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21425318908900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23593555388032).

21425318908900 is an abundant number, since it is smaller than the sum of its proper divisors (25761791867164).

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

21425318908900 is a wasteful number, since it uses less digits than its factorization.

21425318908900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3567101 (or 3567094 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 21425318908900 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred eighteen million, nine hundred eight thousand, nine hundred".