31211132130 has 24 divisors (see below), whose sum is σ = 81148943772. Its totient is φ = 8322968544.

The previous prime is 31211132123. The next prime is 31211132137. The reversal of 31211132130 is 3123111213.

31211132130 is a `hidden beast` number, since 312 + 1 + 1 + 1 + 321 + 30 = 666.

It is an interprime number because it is at equal distance from previous prime (31211132123) and next prime (31211132137).

It can be written as a sum of positive squares in 2 ways, for example, as 30379444209 + 831687921 = 174297^2 + 28839^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31211132137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173395089 + ... + 173395268.

Almost surely, 2^31211132130 is an apocalyptic number.

31211132130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31211132130 is an abundant number, since it is smaller than the sum of its proper divisors (49937811642).

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

31211132130 is a wasteful number, since it uses less digits than its factorization.

31211132130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346790370 (or 346790367 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31211132130 its reverse (3123111213), we get a palindrome (34334243343).

The spelling of 31211132130 in words is "thirty-one billion, two hundred eleven million, one hundred thirty-two thousand, one hundred thirty".