221231123101 has 2 divisors, whose sum is σ = 221231123102. Its totient is φ = 221231123100.

The previous prime is 221231123083. The next prime is 221231123117. The reversal of 221231123101 is 101321132122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206207718201 + 15023404900 = 454101^2 + 122570^2 .

It is a cyclic number.

It is not a de Polignac number, because 221231123101 - 2¹¹ = 221231121053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221231123171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110615561550 + 110615561551.

It is an arithmetic number, because the mean of its divisors is an integer number (110615561551).

Almost surely, 2^221231123101 is an apocalyptic number.

It is an amenable number.

221231123101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221231123101 is an equidigital number, since it uses as much as digits as its factorization.

221231123101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221231123101 its reverse (101321132122), we get a palindrome (322552255223).

The spelling of 221231123101 in words is "two hundred twenty-one billion, two hundred thirty-one million, one hundred twenty-three thousand, one hundred one".