31211222130 has 80 divisors (see below), whose sum is σ = 91552944384. Its totient is φ = 7566354720.

The previous prime is 31211222117. The next prime is 31211222137. The reversal of 31211222130 is 3122211213.

31211222130 is a `hidden beast` number, since 312 + 1 + 1 + 222 + 130 = 666.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31211222137) 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 39 ways as a sum of consecutive naturals, for example, 1742562 + ... + 1760381.

Almost surely, 2^31211222130 is an apocalyptic number.

31211222130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31211222130 is an abundant number, since it is smaller than the sum of its proper divisors (60341722254).

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

31211222130 is a wasteful number, since it uses less digits than its factorization.

31211222130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502973 (or 3502964 counting only the distinct ones).

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

Adding to 31211222130 its reverse (3122211213), we get a palindrome (34333433343).

The spelling of 31211222130 in words is "thirty-one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred thirty".