21320322 has 16 divisors (see below), whose sum is σ = 42692832. Its totient is φ = 7098080.

The previous prime is 21320317. The next prime is 21320323. The reversal of 21320322 is 22302312.

It is a super-2 number, since 2×21320322² = 909112260367368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21320323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4918 + ... + 8174.

It is an arithmetic number, because the mean of its divisors is an integer number (2668302).

Almost surely, 2^21320322 is an apocalyptic number.

21320322 is an abundant number, since it is smaller than the sum of its proper divisors (21372510).

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

21320322 is a wasteful number, since it uses less digits than its factorization.

21320322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21320322 is about 4617.3934205350. The cubic root of 21320322 is about 277.2881135566.

Adding to 21320322 its reverse (22302312), we get a palindrome (43622634).

The spelling of 21320322 in words is "twenty-one million, three hundred twenty thousand, three hundred twenty-two".