21332370 has 32 divisors (see below), whose sum is σ = 51851520. Its totient is φ = 5616000.

The previous prime is 21332369. The next prime is 21332393. The reversal of 21332370 is 7323312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2131 + ... + 6870.

It is an arithmetic number, because the mean of its divisors is an integer number (1620360).

Almost surely, 2^21332370 is an apocalyptic number.

21332370 is an abundant number, since it is smaller than the sum of its proper divisors (30519150).

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

21332370 is a wasteful number, since it uses less digits than its factorization.

21332370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9090.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 21332370 is about 4618.6978684473. The cubic root of 21332370 is about 277.3403350647.

Adding to 21332370 its reverse (7323312), we get a palindrome (28655682).

The spelling of 21332370 in words is "twenty-one million, three hundred thirty-two thousand, three hundred seventy".