21712596 has 12 divisors (see below), whose sum is σ = 50662752. Its totient is φ = 7237528.

The previous prime is 21712567. The next prime is 21712631. The reversal of 21712596 is 69521712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904680 + ... + 904703.

It is an arithmetic number, because the mean of its divisors is an integer number (4221896).

Almost surely, 2^21712596 is an apocalyptic number.

It is an amenable number.

21712596 is an abundant number, since it is smaller than the sum of its proper divisors (28950156).

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

21712596 is a wasteful number, since it uses less digits than its factorization.

21712596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809390 (or 1809388 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 21712596 is about 4659.6776712558. The cubic root of 21712596 is about 278.9784030250.

The spelling of 21712596 in words is "twenty-one million, seven hundred twelve thousand, five hundred ninety-six".