21295056 has 40 divisors (see below), whose sum is σ = 57407040. Its totient is φ = 6789376.

The previous prime is 21295051. The next prime is 21295073. The reversal of 21295056 is 65059212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21295051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8541 + ... + 10748.

It is an arithmetic number, because the mean of its divisors is an integer number (1435176).

Almost surely, 2^21295056 is an apocalyptic number.

It is an amenable number.

21295056 is an abundant number, since it is smaller than the sum of its proper divisors (36111984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21295056 is a wasteful number, since it uses less digits than its factorization.

21295056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19323 (or 19317 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 21295056 is about 4614.6566502829. The cubic root of 21295056 is about 277.1785353052.

The spelling of 21295056 in words is "twenty-one million, two hundred ninety-five thousand, fifty-six".