21464955 has 24 divisors (see below), whose sum is σ = 38074608. Its totient is φ = 11180736.

The previous prime is 21464953. The next prime is 21464983. The reversal of 21464955 is 55946412.

21464955 is a `hidden beast` number, since 2 + 1 + 4 + 649 + 5 + 5 = 666.

It is not a de Polignac number, because 21464955 - 2¹ = 21464953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21464953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3612 + ... + 7481.

It is an arithmetic number, because the mean of its divisors is an integer number (1586442).

Almost surely, 2^21464955 is an apocalyptic number.

21464955 is a deficient number, since it is larger than the sum of its proper divisors (16609653).

21464955 is a wasteful number, since it uses less digits than its factorization.

21464955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11147 (or 11144 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 21464955 is about 4633.0287070123. The cubic root of 21464955 is about 277.9137242411.

The spelling of 21464955 in words is "twenty-one million, four hundred sixty-four thousand, nine hundred fifty-five".