21374288 has 20 divisors (see below), whose sum is σ = 44598708. Its totient is φ = 9864960.

The previous prime is 21374281. The next prime is 21374293. The reversal of 21374288 is 88247312.

It can be written as a sum of positive squares in 2 ways, for example, as 13601344 + 7772944 = 3688^2 + 2788^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374281) 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, 51173 + ... + 51588.

Almost surely, 2^21374288 is an apocalyptic number.

It is an amenable number.

21374288 is an abundant number, since it is smaller than the sum of its proper divisors (23224420).

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

21374288 is a wasteful number, since it uses less digits than its factorization.

21374288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102782 (or 102776 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 21374288 is about 4623.2335004843. The cubic root of 21374288 is about 277.5218736647.

The spelling of 21374288 in words is "twenty-one million, three hundred seventy-four thousand, two hundred eighty-eight".