23211312 has 80 divisors (see below), whose sum is σ = 65233920. Its totient is φ = 7084800.

The previous prime is 23211311. The next prime is 23211313. The reversal of 23211312 is 21311232.

It is an interprime number because it is at equal distance from previous prime (23211311) and next prime (23211313).

It is a super-2 number, since 2×23211312² = 1077530009522688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 23211291 and 23211300.

It is not an unprimeable number, because it can be changed into a prime (23211311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27862 + ... + 28682.

It is an arithmetic number, because the mean of its divisors is an integer number (815424).

Almost surely, 2^23211312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23211312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32616960).

23211312 is an abundant number, since it is smaller than the sum of its proper divisors (42022608).

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

23211312 is a wasteful number, since it uses less digits than its factorization.

23211312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882 (or 876 counting only the distinct ones).

The product of its digits is 72, while the sum is 15.

The square root of 23211312 is about 4817.8119514983. The cubic root of 23211312 is about 285.2549764945.

Adding to 23211312 its reverse (21311232), we get a palindrome (44522544).

The spelling of 23211312 in words is "twenty-three million, two hundred eleven thousand, three hundred twelve".