213113211218 has 4 divisors (see below), whose sum is σ = 319669816830. Its totient is φ = 106556605608.

The previous prime is 213113211211. The next prime is 213113211251. The reversal of 213113211218 is 812112311312.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 198289418209 + 14823793009 = 445297^2 + 121753^2 .

It is not an unprimeable number, because it can be changed into a prime (213113211211) 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 as a sum of consecutive naturals, namely, 53278302803 + ... + 53278302806.

Almost surely, 2^213113211218 is an apocalyptic number.

213113211218 is a deficient number, since it is larger than the sum of its proper divisors (106556605612).

213113211218 is a wasteful number, since it uses less digits than its factorization.

213113211218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106556605611.

The product of its digits is 576, while the sum is 26.

The spelling of 213113211218 in words is "two hundred thirteen billion, one hundred thirteen million, two hundred eleven thousand, two hundred eighteen".