23131212 has 48 divisors (see below), whose sum is σ = 60140640. Its totient is φ = 6870528.

The previous prime is 23131211. The next prime is 23131231. The reversal of 23131212 is 21213132.

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 = 23131191 and 23131200.

It is not an unprimeable number, because it can be changed into a prime (23131211) 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, 1968 + ... + 7080.

It is an arithmetic number, because the mean of its divisors is an integer number (1252930).

Almost surely, 2^23131212 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 23131212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30070320).

23131212 is an abundant number, since it is smaller than the sum of its proper divisors (37009428).

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

23131212 is a wasteful number, since it uses less digits than its factorization.

23131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5162 (or 5160 counting only the distinct ones).

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

The square root of 23131212 is about 4809.4918650519. The cubic root of 23131212 is about 284.9264691807.

Adding to 23131212 its reverse (21213132), we get a palindrome (44344344).

The spelling of 23131212 in words is "twenty-three million, one hundred thirty-one thousand, two hundred twelve".