31231221332130 has 160 divisors (see below), whose sum is σ = 84493360296576. Its totient is φ = 8277160248576.

The previous prime is 31231221332117. The next prime is 31231221332131. The reversal of 31231221332130 is 3123312213213.

31231221332130 is a `hidden beast` number, since 3 + 1 + 2 + 312 + 2 + 1 + 332 + 13 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31231221332094 and 31231221332103.

It is not an unprimeable number, because it can be changed into a prime (31231221332131) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1122321277 + ... + 1122349103.

Almost surely, 2^{31231221332130} is an apocalyptic number.

31231221332130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31231221332130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42246680148288).

31231221332130 is an abundant number, since it is smaller than the sum of its proper divisors (53262138964446).

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

31231221332130 is a wasteful number, since it uses less digits than its factorization.

31231221332130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36310 (or 36301 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 31231221332130 its reverse (3123312213213), we get a palindrome (34354533545343).

The spelling of 31231221332130 in words is "thirty-one trillion, two hundred thirty-one billion, two hundred twenty-one million, three hundred thirty-two thousand, one hundred thirty".