21583954452 has 48 divisors (see below), whose sum is σ = 50996619072. Its totient is φ = 7104165120.

The previous prime is 21583954451. The next prime is 21583954463. The reversal of 21583954452 is 25445938512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21583954451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2327008 + ... + 2336264.

It is an arithmetic number, because the mean of its divisors is an integer number (1062429564).

Almost surely, 2^21583954452 is an apocalyptic number.

It is an amenable number.

21583954452 is an abundant number, since it is smaller than the sum of its proper divisors (29412664620).

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

21583954452 is a wasteful number, since it uses less digits than its factorization.

21583954452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11688 (or 11686 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 48.

The spelling of 21583954452 in words is "twenty-one billion, five hundred eighty-three million, nine hundred fifty-four thousand, four hundred fifty-two".