218121011213 has 8 divisors (see below), whose sum is σ = 254585010432. Its totient is φ = 182982975696.

The previous prime is 218121011167. The next prime is 218121011239. The reversal of 218121011213 is 312110121812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 218121011213 - 2⁶ = 218121011149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218121011813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331490570 + ... + 331491227.

It is an arithmetic number, because the mean of its divisors is an integer number (31823126304).

Almost surely, 2^218121011213 is an apocalyptic number.

It is an amenable number.

218121011213 is a deficient number, since it is larger than the sum of its proper divisors (36463999219).

218121011213 is an equidigital number, since it uses as much as digits as its factorization.

218121011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662981851.

The product of its (nonzero) digits is 192, while the sum is 23.

The spelling of 218121011213 in words is "two hundred eighteen billion, one hundred twenty-one million, eleven thousand, two hundred thirteen".