21902330 has 8 divisors (see below), whose sum is σ = 39424212. Its totient is φ = 8760928.

The previous prime is 21902317. The next prime is 21902333. The reversal of 21902330 is 3320912.

It can be written as a sum of positive squares in 2 ways, for example, as 20967241 + 935089 = 4579^2 + 967^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1095107 + ... + 1095126.

Almost surely, 2^21902330 is an apocalyptic number.

21902330 is a deficient number, since it is larger than the sum of its proper divisors (17521882).

21902330 is a wasteful number, since it uses less digits than its factorization.

21902330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190240.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 21902330 is about 4679.9925213615. The cubic root of 21902330 is about 279.7886585487.

The spelling of 21902330 in words is "twenty-one million, nine hundred two thousand, three hundred thirty".