212122618 has 8 divisors (see below), whose sum is σ = 320473440. Its totient is φ = 105298140.

The previous prime is 212122601. The next prime is 212122619. The reversal of 212122618 is 816221212.

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

It is a junction number, because it is equal to n+sod(n) for n = 212122592 and 212122601.

It is not an unprimeable number, because it can be changed into a prime (212122619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381238 + ... + 381793.

It is an arithmetic number, because the mean of its divisors is an integer number (40059180).

Almost surely, 2^212122618 is an apocalyptic number.

212122618 is a deficient number, since it is larger than the sum of its proper divisors (108350822).

212122618 is a wasteful number, since it uses less digits than its factorization.

212122618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763172.

The product of its digits is 768, while the sum is 25.

The square root of 212122618 is about 14564.4298892885. The cubic root of 212122618 is about 596.3881324650.

The spelling of 212122618 in words is "two hundred twelve million, one hundred twenty-two thousand, six hundred eighteen".