21404529024 has 64 divisors (see below), whose sum is σ = 56871936000. Its totient is φ = 7132815872.

The previous prime is 21404529023. The next prime is 21404529053. The reversal of 21404529024 is 42092540412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404529023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2021857 + ... + 2032415.

It is an arithmetic number, because the mean of its divisors is an integer number (888624000).

Almost surely, 2^21404529024 is an apocalyptic number.

21404529024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21404529024 is an abundant number, since it is smaller than the sum of its proper divisors (35467406976).

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

21404529024 is a wasteful number, since it uses less digits than its factorization.

21404529024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15855 (or 15843 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 21404529024 in words is "twenty-one billion, four hundred four million, five hundred twenty-nine thousand, twenty-four".