218121322427 has 2 divisors, whose sum is σ = 218121322428. Its totient is φ = 218121322426.

The previous prime is 218121322333. The next prime is 218121322429. The reversal of 218121322427 is 724223121812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218121322427 - 2¹⁰ = 218121321403 is a prime.

It is a super-2 number, since 2×218121322427² (a number of 23 digits) contains 22 as substring.

Together with 218121322429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218121322429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109060661213 + 109060661214.

It is an arithmetic number, because the mean of its divisors is an integer number (109060661214).

Almost surely, 2^218121322427 is an apocalyptic number.

218121322427 is a deficient number, since it is larger than the sum of its proper divisors (1).

218121322427 is an equidigital number, since it uses as much as digits as its factorization.

218121322427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The spelling of 218121322427 in words is "two hundred eighteen billion, one hundred twenty-one million, three hundred twenty-two thousand, four hundred twenty-seven".