31212102211989 has 16 divisors (see below), whose sum is σ = 42117220908672. Its totient is φ = 20558458948608.

The previous prime is 31212102211931. The next prime is 31212102212033. The reversal of 31212102211989 is 98911220121213.

It is not a de Polignac number, because 31212102211989 - 2⁸ = 31212102211733 is a prime.

It is a super-2 number, since 2×31212102211989² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31212102211989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212102213989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116505972 + ... + 116773565.

It is an arithmetic number, because the mean of its divisors is an integer number (2632326306792).

Almost surely, 2^{31212102211989} is an apocalyptic number.

It is an amenable number.

31212102211989 is a deficient number, since it is larger than the sum of its proper divisors (10905118696683).

31212102211989 is a wasteful number, since it uses less digits than its factorization.

31212102211989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233280076.

The product of its (nonzero) digits is 31104, while the sum is 42.

The spelling of 31212102211989 in words is "thirty-one trillion, two hundred twelve billion, one hundred two million, two hundred eleven thousand, nine hundred eighty-nine".