21465707 has 4 divisors (see below), whose sum is σ = 21608016. Its totient is φ = 21323400.

The previous prime is 21465701. The next prime is 21465727. The reversal of 21465707 is 70756412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21465707 - 2¹⁰ = 21464683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21465701) 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 3 ways as a sum of consecutive naturals, for example, 70928 + ... + 71229.

It is an arithmetic number, because the mean of its divisors is an integer number (5402004).

Almost surely, 2^21465707 is an apocalyptic number.

21465707 is a deficient number, since it is larger than the sum of its proper divisors (142309).

21465707 is a wasteful number, since it uses less digits than its factorization.

21465707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142308.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21465707 is about 4633.1098627164. The cubic root of 21465707 is about 277.9169696658.

The spelling of 21465707 in words is "twenty-one million, four hundred sixty-five thousand, seven hundred seven".