21500748 has 24 divisors (see below), whose sum is σ = 55742960. Its totient is φ = 7166880.

The previous prime is 21500747. The next prime is 21500753. The reversal of 21500748 is 84700512.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21500741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99433 + ... + 99648.

Almost surely, 2^21500748 is an apocalyptic number.

It is an amenable number.

21500748 is an abundant number, since it is smaller than the sum of its proper divisors (34242212).

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

21500748 is a wasteful number, since it uses less digits than its factorization.

21500748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199094 (or 199086 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 21500748 is about 4636.8899059607. The cubic root of 21500748 is about 278.0681129792.

The spelling of 21500748 in words is "twenty-one million, five hundred thousand, seven hundred forty-eight".