31421212212 has 48 divisors (see below), whose sum is σ = 79175940480. Its totient is φ = 9641117568.

The previous prime is 31421212169. The next prime is 31421212213. The reversal of 31421212212 is 21221212413.

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 not an unprimeable number, because it can be changed into a prime (31421212213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224523 + ... + 336530.

It is an arithmetic number, because the mean of its divisors is an integer number (1649498760).

Almost surely, 2^31421212212 is an apocalyptic number.

It is an amenable number.

31421212212 is an abundant number, since it is smaller than the sum of its proper divisors (47754728268).

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

31421212212 is a wasteful number, since it uses less digits than its factorization.

31421212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561432 (or 561430 counting only the distinct ones).

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

Adding to 31421212212 its reverse (21221212413), we get a palindrome (52642424625).

The spelling of 31421212212 in words is "thirty-one billion, four hundred twenty-one million, two hundred twelve thousand, two hundred twelve".