218938100231 has 2 divisors, whose sum is σ = 218938100232. Its totient is φ = 218938100230.

The previous prime is 218938100219. The next prime is 218938100287. The reversal of 218938100231 is 132001839812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218938100231 is a prime.

It is a super-2 number, since 2×218938100231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218938100131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109469050115 + 109469050116.

It is an arithmetic number, because the mean of its divisors is an integer number (109469050116).

Almost surely, 2^218938100231 is an apocalyptic number.

218938100231 is a deficient number, since it is larger than the sum of its proper divisors (1).

218938100231 is an equidigital number, since it uses as much as digits as its factorization.

218938100231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 218938100231 in words is "two hundred eighteen billion, nine hundred thirty-eight million, one hundred thousand, two hundred thirty-one".