218102830721 has 2 divisors, whose sum is σ = 218102830722. Its totient is φ = 218102830720.

The previous prime is 218102830681. The next prime is 218102830747. The reversal of 218102830721 is 127038201812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136429764496 + 81673066225 = 369364^2 + 285785^2 .

It is a cyclic number.

It is not a de Polignac number, because 218102830721 - 2³⁰ = 217029088897 is a prime.

It is not a weakly prime, because it can be changed into another prime (218122830721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109051415360 + 109051415361.

It is an arithmetic number, because the mean of its divisors is an integer number (109051415361).

Almost surely, 2^218102830721 is an apocalyptic number.

It is an amenable number.

218102830721 is a deficient number, since it is larger than the sum of its proper divisors (1).

218102830721 is an equidigital number, since it uses as much as digits as its factorization.

218102830721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The spelling of 218102830721 in words is "two hundred eighteen billion, one hundred two million, eight hundred thirty thousand, seven hundred twenty-one".