221211234422831 has 2 divisors, whose sum is σ = 221211234422832. Its totient is φ = 221211234422830.

The previous prime is 221211234422791. The next prime is 221211234422851. The reversal of 221211234422831 is 138224432112122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221211234422831 - 2¹⁴ = 221211234406447 is a prime.

It is a super-2 number, since 2×221211234422831² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211234422851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605617211415 + 110605617211416.

It is an arithmetic number, because the mean of its divisors is an integer number (110605617211416).

Almost surely, 2^{221211234422831} is an apocalyptic number.

221211234422831 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211234422831 is an equidigital number, since it uses as much as digits as its factorization.

221211234422831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 38.

Adding to 221211234422831 its reverse (138224432112122), we get a palindrome (359435666534953).

The spelling of 221211234422831 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred thirty-four million, four hundred twenty-two thousand, eight hundred thirty-one".