31212212130 has 96 divisors (see below), whose sum is σ = 89341686720. Its totient is φ = 7497152640.

The previous prime is 31212212089. The next prime is 31212212131. The reversal of 31212212130 is 3121221213.

31212212130 is a `hidden beast` number, since 312 + 1 + 221 + 2 + 130 = 666.

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 (31212212131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36712 + ... + 252531.

It is an arithmetic number, because the mean of its divisors is an integer number (930642570).

Almost surely, 2^31212212130 is an apocalyptic number.

31212212130 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 31212212130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44670843360).

31212212130 is an abundant number, since it is smaller than the sum of its proper divisors (58129474590).

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

31212212130 is a wasteful number, since it uses less digits than its factorization.

31212212130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289376 (or 289373 counting only the distinct ones).

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

Adding to 31212212130 its reverse (3121221213), we get a palindrome (34333433343).

It can be divided in two parts, 31212 and 212130, that added together give a palindrome (243342).

The spelling of 31212212130 in words is "thirty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred thirty".