21360705 has 32 divisors (see below), whose sum is σ = 35831808. Its totient is φ = 10852800.

The previous prime is 21360697. The next prime is 21360707. The reversal of 21360705 is 50706312.

It is not a de Polignac number, because 21360705 - 2³ = 21360697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21360707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32692 + ... + 33338.

It is an arithmetic number, because the mean of its divisors is an integer number (1119744).

Almost surely, 2^21360705 is an apocalyptic number.

It is an amenable number.

21360705 is a deficient number, since it is larger than the sum of its proper divisors (14471103).

21360705 is a wasteful number, since it uses less digits than its factorization.

21360705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 21360705 is about 4621.7642735215. The cubic root of 21360705 is about 277.4630743822.

The spelling of 21360705 in words is "twenty-one million, three hundred sixty thousand, seven hundred five".