21590679 has 16 divisors (see below), whose sum is σ = 31497984. Its totient is φ = 13046400.

The previous prime is 21590671. The next prime is 21590689. The reversal of 21590679 is 97609512.

It is not a de Polignac number, because 21590679 - 2³ = 21590671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21590671) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13534 + ... + 15044.

It is an arithmetic number, because the mean of its divisors is an integer number (1968624).

Almost surely, 2^21590679 is an apocalyptic number.

21590679 is a deficient number, since it is larger than the sum of its proper divisors (9907305).

21590679 is a wasteful number, since it uses less digits than its factorization.

21590679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 21590679 is about 4646.5771273056. The cubic root of 21590679 is about 278.4552647628.

The spelling of 21590679 in words is "twenty-one million, five hundred ninety thousand, six hundred seventy-nine".