218877422921 has 8 divisors (see below), whose sum is σ = 220123176480. Its totient is φ = 217631924992.

The previous prime is 218877422879. The next prime is 218877422923. The reversal of 218877422921 is 129224778812.

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 218877422921 - 2¹⁰ = 218877421897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218877422923) 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, 1808906 + ... + 1926108.

It is an arithmetic number, because the mean of its divisors is an integer number (27515397060).

Almost surely, 2^218877422921 is an apocalyptic number.

It is an amenable number.

218877422921 is a deficient number, since it is larger than the sum of its proper divisors (1245753559).

218877422921 is a wasteful number, since it uses less digits than its factorization.

218877422921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127815.

The product of its digits is 1806336, while the sum is 53.

The spelling of 218877422921 in words is "two hundred eighteen billion, eight hundred seventy-seven million, four hundred twenty-two thousand, nine hundred twenty-one".