221211134231 has 2 divisors, whose sum is σ = 221211134232. Its totient is φ = 221211134230.

The previous prime is 221211134213. The next prime is 221211134239. The reversal of 221211134231 is 132431112122.

Together with previous prime (221211134213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221211134231 - 2¹⁰ = 221211133207 is a prime.

It is a super-2 number, since 2×221211134231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221211134197 and 221211134206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211134239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605567115 + 110605567116.

It is an arithmetic number, because the mean of its divisors is an integer number (110605567116).

Almost surely, 2^221211134231 is an apocalyptic number.

221211134231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211134231 is an equidigital number, since it uses as much as digits as its factorization.

221211134231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

Adding to 221211134231 its reverse (132431112122), we get a palindrome (353642246353).

The spelling of 221211134231 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred thirty-four thousand, two hundred thirty-one".