21875707 has 12 divisors (see below), whose sum is σ = 26787720. Its totient is φ = 17762976.

The previous prime is 21875699. The next prime is 21875713. The reversal of 21875707 is 70757812.

It is not a de Polignac number, because 21875707 - 2³ = 21875699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21875747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10818 + ... + 12679.

It is an arithmetic number, because the mean of its divisors is an integer number (2232310).

Almost surely, 2^21875707 is an apocalyptic number.

21875707 is a deficient number, since it is larger than the sum of its proper divisors (4912013).

21875707 is a wasteful number, since it uses less digits than its factorization.

21875707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23530 (or 23523 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 21875707 is about 4677.1473143360. The cubic root of 21875707 is about 279.6752484901.

The spelling of 21875707 in words is "twenty-one million, eight hundred seventy-five thousand, seven hundred seven".