218350557021 has 8 divisors (see below), whose sum is σ = 308259609984. Its totient is φ = 137004271040.

The previous prime is 218350556989. The next prime is 218350557083. The reversal of 218350557021 is 120755053812.

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 218350557021 - 2⁵ = 218350556989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218350557121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2140691685 + ... + 2140691786.

It is an arithmetic number, because the mean of its divisors is an integer number (38532451248).

Almost surely, 2^218350557021 is an apocalyptic number.

It is an amenable number.

218350557021 is a deficient number, since it is larger than the sum of its proper divisors (89909052963).

218350557021 is a wasteful number, since it uses less digits than its factorization.

218350557021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4281383491.

The product of its (nonzero) digits is 84000, while the sum is 39.

The spelling of 218350557021 in words is "two hundred eighteen billion, three hundred fifty million, five hundred fifty-seven thousand, twenty-one".