21480907 has 16 divisors (see below), whose sum is σ = 25157632. Its totient is φ = 17962560.

The previous prime is 21480889. The next prime is 21480913. The reversal of 21480907 is 70908412.

It is a de Polignac number, because none of the positive numbers 2^k-21480907 is a prime.

It is a super-2 number, since 2×21480907² = 922858731085298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21480947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64732 + ... + 65062.

It is an arithmetic number, because the mean of its divisors is an integer number (1572352).

Almost surely, 2^21480907 is an apocalyptic number.

21480907 is a deficient number, since it is larger than the sum of its proper divisors (3676725).

21480907 is a wasteful number, since it uses less digits than its factorization.

21480907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21480907 is about 4634.7499393171. The cubic root of 21480907 is about 277.9825524305.

The spelling of 21480907 in words is "twenty-one million, four hundred eighty thousand, nine hundred seven".