31212103140 has 48 divisors (see below), whose sum is σ = 97104322560. Its totient is φ = 8323227360.

The previous prime is 31212103133. The next prime is 31212103157. The reversal of 31212103140 is 4130121213.

31212103140 is a `hidden beast` number, since 312 + 1 + 210 + 3 + 140 = 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28899556 + ... + 28900635.

It is an arithmetic number, because the mean of its divisors is an integer number (2023006720).

Almost surely, 2^31212103140 is an apocalyptic number.

31212103140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31212103140 is an abundant number, since it is smaller than the sum of its proper divisors (65892219420).

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

31212103140 is a wasteful number, since it uses less digits than its factorization.

31212103140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57800209 (or 57800201 counting only the distinct ones).

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

Adding to 31212103140 its reverse (4130121213), we get a palindrome (35342224353).

The spelling of 31212103140 in words is "thirty-one billion, two hundred twelve million, one hundred three thousand, one hundred forty".