123221169251 has 2 divisors, whose sum is σ = 123221169252. Its totient is φ = 123221169250.

The previous prime is 123221169233. The next prime is 123221169307. The reversal of 123221169251 is 152961122321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123221169251 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (123221669251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610584625 + 61610584626.

It is an arithmetic number, because the mean of its divisors is an integer number (61610584626).

Almost surely, 2^123221169251 is an apocalyptic number.

123221169251 is a deficient number, since it is larger than the sum of its proper divisors (1).

123221169251 is an equidigital number, since it uses as much as digits as its factorization.

123221169251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The spelling of 123221169251 in words is "one hundred twenty-three billion, two hundred twenty-one million, one hundred sixty-nine thousand, two hundred fifty-one".