21258088 has 32 divisors (see below), whose sum is σ = 40982760. Its totient is φ = 10333440.

The previous prime is 21258059. The next prime is 21258101. The reversal of 21258088 is 88085212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10381284 + 10876804 = 3222^2 + 3298^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76606 + ... + 76882.

Almost surely, 2^21258088 is an apocalyptic number.

It is an amenable number.

21258088 is a deficient number, since it is larger than the sum of its proper divisors (19724672).

21258088 is a wasteful number, since it uses less digits than its factorization.

21258088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 21258088 is about 4610.6494119592. The cubic root of 21258088 is about 277.0180493654.

The spelling of 21258088 in words is "twenty-one million, two hundred fifty-eight thousand, eighty-eight".