21524992944 has 320 divisors, whose sum is σ = 71185443840. Its totient is φ = 5451264000.

The previous prime is 21524992943. The next prime is 21524992981. The reversal of 21524992944 is 44929942512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21524992943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31794334 + ... + 31795010.

It is an arithmetic number, because the mean of its divisors is an integer number (222454512).

Almost surely, 2^21524992944 is an apocalyptic number.

21524992944 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 21524992944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35592721920).

21524992944 is an abundant number, since it is smaller than the sum of its proper divisors (49660450896).

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

21524992944 is a wasteful number, since it uses less digits than its factorization.

21524992944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988 (or 982 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The spelling of 21524992944 in words is "twenty-one billion, five hundred twenty-four million, nine hundred ninety-two thousand, nine hundred forty-four".