221213212210231 has 2 divisors, whose sum is σ = 221213212210232. Its totient is φ = 221213212210230.

The previous prime is 221213212210229. The next prime is 221213212210301. The reversal of 221213212210231 is 132012212312122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221213212210231 - 2¹ = 221213212210229 is a prime.

It is a super-2 number, since 2×221213212210231² (a number of 29 digits) contains 22 as substring.

Together with 221213212210229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 221213212210196 and 221213212210205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221213212240231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606606105115 + 110606606105116.

It is an arithmetic number, because the mean of its divisors is an integer number (110606606105116).

Almost surely, 2^{221213212210231} is an apocalyptic number.

221213212210231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221213212210231 is an equidigital number, since it uses as much as digits as its factorization.

221213212210231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 221213212210231 its reverse (132012212312122), we get a palindrome (353225424522353).

The spelling of 221213212210231 in words is "two hundred twenty-one trillion, two hundred thirteen billion, two hundred twelve million, two hundred ten thousand, two hundred thirty-one".