21887296 has 28 divisors (see below), whose sum is σ = 45989748. Its totient is φ = 10299392.

The previous prime is 21887293. The next prime is 21887339. The reversal of 21887296 is 69278812.

It can be written as a sum of positive squares in 2 ways, for example, as 10758400 + 11128896 = 3280^2 + 3336^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21887293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8971 + ... + 11146.

It is an arithmetic number, because the mean of its divisors is an integer number (1642491).

Almost surely, 2^21887296 is an apocalyptic number.

It is an amenable number.

21887296 is an abundant number, since it is smaller than the sum of its proper divisors (24102452).

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

21887296 is a wasteful number, since it uses less digits than its factorization.

21887296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20146 (or 20136 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 21887296 is about 4678.3860464908. The cubic root of 21887296 is about 279.7246272259.

The spelling of 21887296 in words is "twenty-one million, eight hundred eighty-seven thousand, two hundred ninety-six".