21701079 has 12 divisors (see below), whose sum is σ = 31788432. Its totient is φ = 14263200.

The previous prime is 21701051. The next prime is 21701083. The reversal of 21701079 is 97010712.

It is not a de Polignac number, because 21701079 - 2⁵ = 21701047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701039) 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 11 ways as a sum of consecutive naturals, for example, 16342 + ... + 17619.

It is an arithmetic number, because the mean of its divisors is an integer number (2649036).

Almost surely, 2^21701079 is an apocalyptic number.

21701079 is a deficient number, since it is larger than the sum of its proper divisors (10087353).

21701079 is a wasteful number, since it uses less digits than its factorization.

21701079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34038 (or 34035 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 21701079 is about 4658.4416922400. The cubic root of 21701079 is about 278.9290681823.

It can be divided in two parts, 2170 and 1079, that added together give a square (3249 = 57²).

The spelling of 21701079 in words is "twenty-one million, seven hundred one thousand, seventy-nine".