31121302212 has 576 divisors, whose sum is σ = 114943256064. Its totient is φ = 6827950080.

The previous prime is 31121302183. The next prime is 31121302253. The reversal of 31121302212 is 21220312113.

31121302212 is a `hidden beast` number, since 31 + 121 + 302 + 212 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 22665958 + ... + 22667330.

It is an arithmetic number, because the mean of its divisors is an integer number (199554264).

Almost surely, 2^31121302212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31121302212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57471628032).

31121302212 is an abundant number, since it is smaller than the sum of its proper divisors (83821953852).

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

31121302212 is a wasteful number, since it uses less digits than its factorization.

31121302212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 1463 counting only the distinct ones).

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

Adding to 31121302212 its reverse (21220312113), we get a palindrome (52341614325).

Subtracting from 31121302212 its reverse (21220312113), we obtain a palindrome (9900990099).

It can be divided in two parts, 31121 and 302212, that added together give a palindrome (333333).

The spelling of 31121302212 in words is "thirty-one billion, one hundred twenty-one million, three hundred two thousand, two hundred twelve".