212105115931 has 4 divisors (see below), whose sum is σ = 212106683152. Its totient is φ = 212103548712.

The previous prime is 212105115923. The next prime is 212105115941. The reversal of 212105115931 is 139511501212.

212105115931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212105115931 - 2³ = 212105115923 is a prime.

It is a super-2 number, since 2×212105115931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212105115893 and 212105115902.

It is not an unprimeable number, because it can be changed into a prime (212105115941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559176 + ... + 858421.

It is an arithmetic number, because the mean of its divisors is an integer number (53026670788).

Almost surely, 2^212105115931 is an apocalyptic number.

212105115931 is a deficient number, since it is larger than the sum of its proper divisors (1567221).

212105115931 is a wasteful number, since it uses less digits than its factorization.

212105115931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567220.

The product of its (nonzero) digits is 2700, while the sum is 31.

The spelling of 212105115931 in words is "two hundred twelve billion, one hundred five million, one hundred fifteen thousand, nine hundred thirty-one".