21495552 has 72 divisors (see below), whose sum is σ = 61638864. Its totient is φ = 6610944.

The previous prime is 21495541. The next prime is 21495569. The reversal of 21495552 is 25559412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8908 + ... + 11060.

Almost surely, 2^21495552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21495552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30819432).

21495552 is an abundant number, since it is smaller than the sum of its proper divisors (40143312).

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

21495552 is a wasteful number, since it uses less digits than its factorization.

21495552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185 (or 2171 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 21495552 is about 4636.3295827626. The cubic root of 21495552 is about 278.0457113039.

The spelling of 21495552 in words is "twenty-one million, four hundred ninety-five thousand, five hundred fifty-two".