31221412212 has 24 divisors (see below), whose sum is σ = 72999564736. Its totient is φ = 10385765568.

The previous prime is 31221412207. The next prime is 31221412297. The reversal of 31221412212 is 21221412213.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2665393 + ... + 2677080.

Almost surely, 2^31221412212 is an apocalyptic number.

It is an amenable number.

31221412212 is an abundant number, since it is smaller than the sum of its proper divisors (41778152524).

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

31221412212 is a wasteful number, since it uses less digits than its factorization.

31221412212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5342967 (or 5342965 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

Adding to 31221412212 its reverse (21221412213), we get a palindrome (52442824425).

Subtracting from 31221412212 its reverse (21221412213), we obtain a palindrome (9999999999).

The spelling of 31221412212 in words is "thirty-one billion, two hundred twenty-one million, four hundred twelve thousand, two hundred twelve".