124005206921 has 2 divisors, whose sum is σ = 124005206922. Its totient is φ = 124005206920.

The previous prime is 124005206917. The next prime is 124005206957. The reversal of 124005206921 is 129602500421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122877590521 + 1127616400 = 350539^2 + 33580^2 .

It is a cyclic number.

It is not a de Polignac number, because 124005206921 - 2² = 124005206917 is a prime.

It is not a weakly prime, because it can be changed into another prime (124005206621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62002603460 + 62002603461.

It is an arithmetic number, because the mean of its divisors is an integer number (62002603461).

Almost surely, 2^124005206921 is an apocalyptic number.

It is an amenable number.

124005206921 is a deficient number, since it is larger than the sum of its proper divisors (1).

124005206921 is an equidigital number, since it uses as much as digits as its factorization.

124005206921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 124005206921 in words is "one hundred twenty-four billion, five million, two hundred six thousand, nine hundred twenty-one".