21022488 has 24 divisors (see below), whose sum is σ = 56936100. Its totient is φ = 7007472.

The previous prime is 21022471. The next prime is 21022517. The reversal of 21022488 is 88422012.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 145918 + ... + 146061.

Almost surely, 2^21022488 is an apocalyptic number.

It is an amenable number.

21022488 is an abundant number, since it is smaller than the sum of its proper divisors (35913612).

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

21022488 is a wasteful number, since it uses less digits than its factorization.

21022488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291991 (or 291984 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21022488 is about 4585.0286803901. The cubic root of 21022488 is about 275.9908629615.

The spelling of 21022488 in words is "twenty-one million, twenty-two thousand, four hundred eighty-eight".