123221311001021 has 2 divisors, whose sum is σ = 123221311001022. Its totient is φ = 123221311001020.

The previous prime is 123221311001011. The next prime is 123221311001029. The reversal of 123221311001021 is 120100113122321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68448138208921 + 54773172792100 = 8273339^2 + 7400890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123221311001021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123221311000984 and 123221311001002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123221311001029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610655500510 + 61610655500511.

It is an arithmetic number, because the mean of its divisors is an integer number (61610655500511).

Almost surely, 2^{123221311001021} is an apocalyptic number.

It is an amenable number.

123221311001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123221311001021 is an equidigital number, since it uses as much as digits as its factorization.

123221311001021 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 20.

Adding to 123221311001021 its reverse (120100113122321), we get a palindrome (243321424123342).

The spelling of 123221311001021 in words is "one hundred twenty-three trillion, two hundred twenty-one billion, three hundred eleven million, one thousand, twenty-one".