124321666921 has 2 divisors, whose sum is σ = 124321666922. Its totient is φ = 124321666920.

The previous prime is 124321666879. The next prime is 124321666933. The reversal of 124321666921 is 129666123421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122385226896 + 1936440025 = 349836^2 + 44005^2 .

It is a cyclic number.

It is not a de Polignac number, because 124321666921 - 2⁹ = 124321666409 is a prime.

It is not a weakly prime, because it can be changed into another prime (124321666981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62160833460 + 62160833461.

It is an arithmetic number, because the mean of its divisors is an integer number (62160833461).

Almost surely, 2^124321666921 is an apocalyptic number.

It is an amenable number.

124321666921 is a deficient number, since it is larger than the sum of its proper divisors (1).

124321666921 is an equidigital number, since it uses as much as digits as its factorization.

124321666921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 43.

The spelling of 124321666921 in words is "one hundred twenty-four billion, three hundred twenty-one million, six hundred sixty-six thousand, nine hundred twenty-one".