21710907 has 6 divisors (see below), whose sum is σ = 31360212. Its totient is φ = 14473932.

The previous prime is 21710869. The next prime is 21710917. The reversal of 21710907 is 70901712.

It is not a de Polignac number, because 21710907 - 2¹¹ = 21708859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21710917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1206153 + ... + 1206170.

It is an arithmetic number, because the mean of its divisors is an integer number (5226702).

Almost surely, 2^21710907 is an apocalyptic number.

21710907 is a deficient number, since it is larger than the sum of its proper divisors (9649305).

21710907 is a wasteful number, since it uses less digits than its factorization.

21710907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412329 (or 2412326 counting only the distinct ones).

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

The square root of 21710907 is about 4659.4964320192. The cubic root of 21710907 is about 278.9711690253.

The spelling of 21710907 in words is "twenty-one million, seven hundred ten thousand, nine hundred seven".