21954465 has 24 divisors (see below), whose sum is σ = 40982760. Its totient is φ = 10808064.

The previous prime is 21954461. The next prime is 21954487. The reversal of 21954465 is 56445912.

21954465 is a `hidden beast` number, since 2 + 195 + 4 + 465 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 720801 + 21233664 = 849^2 + 4608^2 .

It is not a de Polignac number, because 21954465 - 2² = 21954461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954461) 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, 18180 + ... + 19349.

It is an arithmetic number, because the mean of its divisors is an integer number (1707615).

Almost surely, 2^21954465 is an apocalyptic number.

It is an amenable number.

21954465 is a deficient number, since it is larger than the sum of its proper divisors (19028295).

21954465 is a wasteful number, since it uses less digits than its factorization.

21954465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37553 (or 37550 counting only the distinct ones).

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

The square root of 21954465 is about 4685.5591982174. The cubic root of 21954465 is about 280.0104800499.

The spelling of 21954465 in words is "twenty-one million, nine hundred fifty-four thousand, four hundred sixty-five".