31212213424 has 20 divisors (see below), whose sum is σ = 69112758544. Its totient is φ = 13376662848.

The previous prime is 31212213421. The next prime is 31212213427. The reversal of 31212213424 is 42431221213.

It is an interprime number because it is at equal distance from previous prime (31212213421) and next prime (31212213427).

It is not an unprimeable number, because it can be changed into a prime (31212213421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139340127 + ... + 139340350.

Almost surely, 2^31212213424 is an apocalyptic number.

It is an amenable number.

31212213424 is an abundant number, since it is smaller than the sum of its proper divisors (37900545120).

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

31212213424 is a wasteful number, since it uses less digits than its factorization.

31212213424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278680492 (or 278680486 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 31212213424 its reverse (42431221213), we get a palindrome (73643434637).

The spelling of 31212213424 in words is "thirty-one billion, two hundred twelve million, two hundred thirteen thousand, four hundred twenty-four".