21885707 has 2 divisors, whose sum is σ = 21885708. Its totient is φ = 21885706.

The previous prime is 21885697. The next prime is 21885737. The reversal of 21885707 is 70758812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21885707 - 2¹² = 21881611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21885737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942853 + 10942854.

It is an arithmetic number, because the mean of its divisors is an integer number (10942854).

Almost surely, 2^21885707 is an apocalyptic number.

21885707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21885707 is an equidigital number, since it uses as much as digits as its factorization.

21885707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 21885707 is about 4678.2162198855. The cubic root of 21885707 is about 279.7178578015.

The spelling of 21885707 in words is "twenty-one million, eight hundred eighty-five thousand, seven hundred seven".