31302121212 has 36 divisors (see below), whose sum is σ = 81263318136. Its totient is φ = 10152038880.

The previous prime is 31302121183. The next prime is 31302121219. The reversal of 31302121212 is 21212120313.

31302121212 is a `hidden beast` number, since 31 + 302 + 121 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302121219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11748714 + ... + 11751377.

Almost surely, 2^31302121212 is an apocalyptic number.

It is an amenable number.

31302121212 is an abundant number, since it is smaller than the sum of its proper divisors (49961196924).

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

31302121212 is a wasteful number, since it uses less digits than its factorization.

31302121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23500138 (or 23500133 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31302121212 its reverse (21212120313), we get a palindrome (52514241525).

The spelling of 31302121212 in words is "thirty-one billion, three hundred two million, one hundred twenty-one thousand, two hundred twelve".