31212011431100 has 36 divisors (see below), whose sum is σ = 68878032018600. Its totient is φ = 12273197712960.

The previous prime is 31212011431087. The next prime is 31212011431103. The reversal of 31212011431100 is 113411021213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212011431103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2645079815 + ... + 2645091614.

Almost surely, 2^{31212011431100} is an apocalyptic number.

It is an amenable number.

31212011431100 is an abundant number, since it is smaller than the sum of its proper divisors (37666020587500).

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

31212011431100 is a wasteful number, since it uses less digits than its factorization.

31212011431100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290171502 (or 5290171495 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31212011431100 its reverse (113411021213), we get a palindrome (31325422452313).

The spelling of 31212011431100 in words is "thirty-one trillion, two hundred twelve billion, eleven million, four hundred thirty-one thousand, one hundred".