218221072923 has 16 divisors (see below), whose sum is σ = 332534198016. Its totient is φ = 124695187680.

The previous prime is 218221072873. The next prime is 218221072931. The reversal of 218221072923 is 329270122812.

It is not a de Polignac number, because 218221072923 - 2⁹ = 218221072411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218221072973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1493728 + ... + 1633298.

It is an arithmetic number, because the mean of its divisors is an integer number (20783387376).

Almost surely, 2^218221072923 is an apocalyptic number.

218221072923 is a deficient number, since it is larger than the sum of its proper divisors (114313125093).

218221072923 is a wasteful number, since it uses less digits than its factorization.

218221072923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214034.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 218221072923 in words is "two hundred eighteen billion, two hundred twenty-one million, seventy-two thousand, nine hundred twenty-three".