21322370 has 16 divisors (see below), whose sum is σ = 40400640. Its totient is φ = 8079984.

The previous prime is 21322361. The next prime is 21322381. The reversal of 21322370 is 7322312.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55922 + ... + 56301.

It is an arithmetic number, because the mean of its divisors is an integer number (2525040).

Almost surely, 2^21322370 is an apocalyptic number.

21322370 is a deficient number, since it is larger than the sum of its proper divisors (19078270).

21322370 is a wasteful number, since it uses less digits than its factorization.

21322370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112249.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 21322370 is about 4617.6151853527. The cubic root of 21322370 is about 277.2969919071.

Adding to 21322370 its reverse (7322312), we get a palindrome (28644682).

The spelling of 21322370 in words is "twenty-one million, three hundred twenty-two thousand, three hundred seventy".