21902336 has 44 divisors (see below), whose sum is σ = 44534532. Its totient is φ = 10764288.

The previous prime is 21902333. The next prime is 21902339. The reversal of 21902336 is 63320912.

It is an interprime number because it is at equal distance from previous prime (21902333) and next prime (21902339).

It can be written as a sum of positive squares in 2 ways, for example, as 17305600 + 4596736 = 4160^2 + 2144^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21902333) 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, 74606 + ... + 74898.

Almost surely, 2^21902336 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 21902336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22267266).

21902336 is an abundant number, since it is smaller than the sum of its proper divisors (22632196).

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

21902336 is an equidigital number, since it uses as much as digits as its factorization.

21902336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 21902336 is about 4679.9931623882. The cubic root of 21902336 is about 279.7886840975.

The spelling of 21902336 in words is "twenty-one million, nine hundred two thousand, three hundred thirty-six".