21153088 has 28 divisors (see below), whose sum is σ = 45793152. Its totient is φ = 9614720.

The previous prime is 21153079. The next prime is 21153091. The reversal of 21153088 is 88035112.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

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, 14320 + ... + 15727.

Almost surely, 2^21153088 is an apocalyptic number.

It is an amenable number.

21153088 is an abundant number, since it is smaller than the sum of its proper divisors (24640064).

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

21153088 is a wasteful number, since it uses less digits than its factorization.

21153088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30070 (or 30060 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 21153088 is about 4599.2486342880. The cubic root of 21153088 is about 276.5612049457.

The spelling of 21153088 in words is "twenty-one million, one hundred fifty-three thousand, eighty-eight".