221131112111401 has 2 divisors, whose sum is σ = 221131112111402. Its totient is φ = 221131112111400.

The previous prime is 221131112111323. The next prime is 221131112111407. The reversal of 221131112111401 is 104111211131122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211222593183001 + 9908518928400 = 14533499^2 + 3147780^2 .

It is a cyclic number.

It is not a de Polignac number, because 221131112111401 - 2¹⁵ = 221131112078633 is a prime.

It is not a weakly prime, because it can be changed into another prime (221131112111407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110565556055700 + 110565556055701.

It is an arithmetic number, because the mean of its divisors is an integer number (110565556055701).

Almost surely, 2^{221131112111401} is an apocalyptic number.

It is an amenable number.

221131112111401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221131112111401 is an equidigital number, since it uses as much as digits as its factorization.

221131112111401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 22.

Adding to 221131112111401 its reverse (104111211131122), we get a palindrome (325242323242523).

The spelling of 221131112111401 in words is "two hundred twenty-one trillion, one hundred thirty-one billion, one hundred twelve million, one hundred eleven thousand, four hundred one".