21550488 has 32 divisors (see below), whose sum is σ = 54639360. Its totient is φ = 7081760.

The previous prime is 21550469. The next prime is 21550493. The reversal of 21550488 is 88405512.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4620 + ... + 8027.

It is an arithmetic number, because the mean of its divisors is an integer number (1707480).

Almost surely, 2^21550488 is an apocalyptic number.

It is an amenable number.

21550488 is an abundant number, since it is smaller than the sum of its proper divisors (33088872).

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

21550488 is a wasteful number, since it uses less digits than its factorization.

21550488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12727 (or 12723 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 21550488 is about 4642.2503163875. The cubic root of 21550488 is about 278.2823761599.

The spelling of 21550488 in words is "twenty-one million, five hundred fifty thousand, four hundred eighty-eight".