23212531 has 8 divisors (see below), whose sum is σ = 24805440. Its totient is φ = 21644928.

The previous prime is 23212529. The next prime is 23212537. The reversal of 23212531 is 13521232.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23212531 - 2¹ = 23212529 is a prime.

It is a super-2 number, since 2×23212531² = 1077643190851922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23212499 and 23212508.

It is not an unprimeable number, because it can be changed into a prime (23212537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4411 + ... + 8116.

It is an arithmetic number, because the mean of its divisors is an integer number (3100680).

Almost surely, 2^23212531 is an apocalyptic number.

23212531 is a deficient number, since it is larger than the sum of its proper divisors (1592909).

23212531 is a wasteful number, since it uses less digits than its factorization.

23212531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12653.

The product of its digits is 360, while the sum is 19.

The square root of 23212531 is about 4817.9384595489. The cubic root of 23212531 is about 285.2599700328.

Adding to 23212531 its reverse (13521232), we get a palindrome (36733763).

The spelling of 23212531 in words is "twenty-three million, two hundred twelve thousand, five hundred thirty-one".