21710955 has 32 divisors (see below), whose sum is σ = 42038784. Its totient is φ = 9340416.

The previous prime is 21710951. The next prime is 21710957. The reversal of 21710955 is 55901712.

It is not a de Polignac number, because 21710955 - 2² = 21710951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21710951) 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, 4297 + ... + 7866.

It is an arithmetic number, because the mean of its divisors is an integer number (1313712).

Almost surely, 2^21710955 is an apocalyptic number.

21710955 is a deficient number, since it is larger than the sum of its proper divisors (20327829).

21710955 is a wasteful number, since it uses less digits than its factorization.

21710955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12195.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 21710955 is about 4659.5015827876. The cubic root of 21710955 is about 278.9713746148.

The spelling of 21710955 in words is "twenty-one million, seven hundred ten thousand, nine hundred fifty-five".