23211320 has 64 divisors (see below), whose sum is σ = 57853440. Its totient is φ = 8310400.

The previous prime is 23211319. The next prime is 23211323. The reversal of 23211320 is 2311232.

It is a happy number.

It is a super-2 number, since 2×23211320² = 1077530752284800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23211295 and 23211304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23211323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30869 + ... + 31611.

It is an arithmetic number, because the mean of its divisors is an integer number (903960).

Almost surely, 2^23211320 is an apocalyptic number.

23211320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23211320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28926720).

23211320 is an abundant number, since it is smaller than the sum of its proper divisors (34642120).

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

23211320 is a wasteful number, since it uses less digits than its factorization.

23211320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 23211320 is about 4817.8127817507. The cubic root of 23211320 is about 285.2550092664.

Adding to 23211320 its reverse (2311232), we get a palindrome (25522552).

The spelling of 23211320 in words is "twenty-three million, two hundred eleven thousand, three hundred twenty".