21437501408 has 96 divisors (see below), whose sum is σ = 43798708800. Its totient is φ = 10321920000.

The previous prime is 21437501399. The next prime is 21437501411. The reversal of 21437501408 is 80410573412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47744768 + ... + 47745216.

It is an arithmetic number, because the mean of its divisors is an integer number (456236550).

Almost surely, 2^21437501408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21437501408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21899354400).

21437501408 is an abundant number, since it is smaller than the sum of its proper divisors (22361207392).

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

21437501408 is a wasteful number, since it uses less digits than its factorization.

21437501408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 21437501408 in words is "twenty-one billion, four hundred thirty-seven million, five hundred one thousand, four hundred eight".