212811379 has 4 divisors (see below), whose sum is σ = 232157880. Its totient is φ = 193464880.

The previous prime is 212811331. The next prime is 212811409. The reversal of 212811379 is 973118212.

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 212811379 - 2⁹ = 212810867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212811329) 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, 9673234 + ... + 9673255.

It is an arithmetic number, because the mean of its divisors is an integer number (58039470).

Almost surely, 2^212811379 is an apocalyptic number.

212811379 is a deficient number, since it is larger than the sum of its proper divisors (19346501).

212811379 is a wasteful number, since it uses less digits than its factorization.

212811379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19346500.

The product of its digits is 6048, while the sum is 34.

The square root of 212811379 is about 14588.0560391027. The cubic root of 212811379 is about 597.0329247750.

The spelling of 212811379 in words is "two hundred twelve million, eight hundred eleven thousand, three hundred seventy-nine".