221331311401 has 2 divisors, whose sum is σ = 221331311402. Its totient is φ = 221331311400.

The previous prime is 221331311393. The next prime is 221331311441. The reversal of 221331311401 is 104113133122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144779489001 + 76551822400 = 380499^2 + 276680^2 .

It is a cyclic number.

It is not a de Polignac number, because 221331311401 - 2³ = 221331311393 is a prime.

It is not a weakly prime, because it can be changed into another prime (221331311441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665655700 + 110665655701.

It is an arithmetic number, because the mean of its divisors is an integer number (110665655701).

Almost surely, 2^221331311401 is an apocalyptic number.

It is an amenable number.

221331311401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221331311401 is an equidigital number, since it uses as much as digits as its factorization.

221331311401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 221331311401 its reverse (104113133122), we get a palindrome (325444444523).

The spelling of 221331311401 in words is "two hundred twenty-one billion, three hundred thirty-one million, three hundred eleven thousand, four hundred one".