123773417021 has 2 divisors, whose sum is σ = 123773417022. Its totient is φ = 123773417020.

The previous prime is 123773416997. The next prime is 123773417041. The reversal of 123773417021 is 120714377321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118414444996 + 5358972025 = 344114^2 + 73205^2 .

It is an emirp because it is prime and its reverse (120714377321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123773417021 - 2¹⁸ = 123773154877 is a prime.

It is a super-2 number, since 2×123773417021² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123773417041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61886708510 + 61886708511.

It is an arithmetic number, because the mean of its divisors is an integer number (61886708511).

Almost surely, 2^123773417021 is an apocalyptic number.

It is an amenable number.

123773417021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123773417021 is an equidigital number, since it uses as much as digits as its factorization.

123773417021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 38.

The spelling of 123773417021 in words is "one hundred twenty-three billion, seven hundred seventy-three million, four hundred seventeen thousand, twenty-one".