21583928124 has 36 divisors (see below), whose sum is σ = 59519318040. Its totient is φ = 6540584160.

The previous prime is 21583928089. The next prime is 21583928129. The reversal of 21583928124 is 42182938512.

21583928124 is a `hidden beast` number, since 21 + 583 + 9 + 28 + 1 + 24 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21583928124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21583928129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27252039 + ... + 27252830.

It is an arithmetic number, because the mean of its divisors is an integer number (1653314390).

Almost surely, 2^21583928124 is an apocalyptic number.

It is an amenable number.

21583928124 is an abundant number, since it is smaller than the sum of its proper divisors (37935389916).

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

21583928124 is a wasteful number, since it uses less digits than its factorization.

21583928124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54504890 (or 54504885 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 21583928124 in words is "twenty-one billion, five hundred eighty-three million, nine hundred twenty-eight thousand, one hundred twenty-four".