221402411231 has 2 divisors, whose sum is σ = 221402411232. Its totient is φ = 221402411230.

The previous prime is 221402411213. The next prime is 221402411257. The reversal of 221402411231 is 132114204122.

Together with previous prime (221402411213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221402411231 is a prime.

It is a super-2 number, since 2×221402411231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221402411197 and 221402411206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221402411201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110701205615 + 110701205616.

It is an arithmetic number, because the mean of its divisors is an integer number (110701205616).

Almost surely, 2^221402411231 is an apocalyptic number.

221402411231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221402411231 is an equidigital number, since it uses as much as digits as its factorization.

221402411231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221402411231 its reverse (132114204122), we get a palindrome (353516615353).

The spelling of 221402411231 in words is "two hundred twenty-one billion, four hundred two million, four hundred eleven thousand, two hundred thirty-one".