21913797024 has 240 divisors, whose sum is σ = 74193134400. Its totient is φ = 6215325696.

The previous prime is 21913797019. The next prime is 21913797029. The reversal of 21913797024 is 42079731912.

21913797024 is a `hidden beast` number, since 2 + 191 + 379 + 70 + 24 = 666.

It is an interprime number because it is at equal distance from previous prime (21913797019) and next prime (21913797029).

It is not an unprimeable number, because it can be changed into a prime (21913797029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2517672 + ... + 2526360.

It is an arithmetic number, because the mean of its divisors is an integer number (309138060).

Almost surely, 2^21913797024 is an apocalyptic number.

21913797024 is a gapful number since it is divisible by the number (24) 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 21913797024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37096567200).

21913797024 is an abundant number, since it is smaller than the sum of its proper divisors (52279337376).

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

21913797024 is a wasteful number, since it uses less digits than its factorization.

21913797024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8857 (or 8840 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The spelling of 21913797024 in words is "twenty-one billion, nine hundred thirteen million, seven hundred ninety-seven thousand, twenty-four".