212312861137 has 4 divisors (see below), whose sum is σ = 228644619700. Its totient is φ = 195981102576.

The previous prime is 212312861063. The next prime is 212312861141. The reversal of 212312861137 is 731168213212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 135073890576 + 77238970561 = 367524^2 + 277919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212312861137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212312861096 and 212312861105.

It is not an unprimeable number, because it can be changed into a prime (212312868137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8165879262 + ... + 8165879287.

It is an arithmetic number, because the mean of its divisors is an integer number (57161154925).

Almost surely, 2^212312861137 is an apocalyptic number.

It is an amenable number.

212312861137 is a deficient number, since it is larger than the sum of its proper divisors (16331758563).

212312861137 is a wasteful number, since it uses less digits than its factorization.

212312861137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16331758562.

The product of its digits is 24192, while the sum is 37.

The spelling of 212312861137 in words is "two hundred twelve billion, three hundred twelve million, eight hundred sixty-one thousand, one hundred thirty-seven".