12213909531 has 24 divisors (see below), whose sum is σ = 18177548064. Its totient is φ = 7896994560.

The previous prime is 12213909529. The next prime is 12213909551. The reversal of 12213909531 is 13590931221.

12213909531 is a `hidden beast` number, since 1 + 22 + 13 + 90 + 9 + 531 = 666.

It is not a de Polignac number, because 12213909531 - 2¹ = 12213909529 is a prime.

It is a super-2 number, since 2×12213909531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12213909551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44595 + ... + 162531.

It is an arithmetic number, because the mean of its divisors is an integer number (757397836).

Almost surely, 2^12213909531 is an apocalyptic number.

12213909531 is a deficient number, since it is larger than the sum of its proper divisors (5963638533).

12213909531 is a wasteful number, since it uses less digits than its factorization.

12213909531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118291 (or 118288 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The spelling of 12213909531 in words is "twelve billion, two hundred thirteen million, nine hundred nine thousand, five hundred thirty-one".