212115818 has 8 divisors (see below), whose sum is σ = 325573248. Its totient is φ = 103591404.

The previous prime is 212115811. The next prime is 212115823. The reversal of 212115818 is 818511212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (212115811) 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, 1233146 + ... + 1233317.

It is an arithmetic number, because the mean of its divisors is an integer number (40696656).

Almost surely, 2^212115818 is an apocalyptic number.

212115818 is a deficient number, since it is larger than the sum of its proper divisors (113457430).

212115818 is a wasteful number, since it uses less digits than its factorization.

212115818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466508.

The product of its digits is 1280, while the sum is 29.

The square root of 212115818 is about 14564.1964419600. The cubic root of 212115818 is about 596.3817596059.

The spelling of 212115818 in words is "two hundred twelve million, one hundred fifteen thousand, eight hundred eighteen".