21712059 has 24 divisors (see below), whose sum is σ = 32947200. Its totient is φ = 13759920.

The previous prime is 21712057. The next prime is 21712063. The reversal of 21712059 is 95021712.

It is not a de Polignac number, because 21712059 - 2¹ = 21712057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21712057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15802 + ... + 17120.

It is an arithmetic number, because the mean of its divisors is an integer number (1372800).

Almost surely, 2^21712059 is an apocalyptic number.

21712059 is a deficient number, since it is larger than the sum of its proper divisors (11235141).

21712059 is a wasteful number, since it uses less digits than its factorization.

21712059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 1412 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 21712059 is about 4659.6200488881. The cubic root of 21712059 is about 278.9761030906.

The spelling of 21712059 in words is "twenty-one million, seven hundred twelve thousand, fifty-nine".