21583974412 has 96 divisors (see below), whose sum is σ = 50823521280. Its totient is φ = 7745829120.

The previous prime is 21583974397. The next prime is 21583974413. The reversal of 21583974412 is 21447938512.

It is not an unprimeable number, because it can be changed into a prime (21583974413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1944414 + ... + 1955482.

It is an arithmetic number, because the mean of its divisors is an integer number (529411680).

Almost surely, 2^21583974412 is an apocalyptic number.

21583974412 is a gapful number since it is divisible by the number (22) 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 21583974412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25411760640).

21583974412 is an abundant number, since it is smaller than the sum of its proper divisors (29239546868).

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

21583974412 is a wasteful number, since it uses less digits than its factorization.

21583974412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11591 (or 11589 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The spelling of 21583974412 in words is "twenty-one billion, five hundred eighty-three million, nine hundred seventy-four thousand, four hundred twelve".