21954256 has 20 divisors (see below), whose sum is σ = 42826500. Its totient is φ = 10902272.

The previous prime is 21954241. The next prime is 21954263. The reversal of 21954256 is 65245912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2944656 + 19009600 = 1716^2 + 4360^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221 + ... + 6988.

It is an arithmetic number, because the mean of its divisors is an integer number (2141325).

Almost surely, 2^21954256 is an apocalyptic number.

It is an amenable number.

21954256 is a deficient number, since it is larger than the sum of its proper divisors (20872244).

21954256 is a wasteful number, since it uses less digits than its factorization.

21954256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9366 (or 9360 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 21954256 is about 4685.5368955969. The cubic root of 21954256 is about 280.0095915082.

The spelling of 21954256 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred fifty-six".