12124117921 has 2 divisors, whose sum is σ = 12124117922. Its totient is φ = 12124117920.

The previous prime is 12124117877. The next prime is 12124117961. The reversal of 12124117921 is 12971142121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12100000000 + 24117921 = 110000^2 + 4911^2 .

It is a cyclic number.

It is not a de Polignac number, because 12124117921 - 2¹¹ = 12124115873 is a prime.

It is not a weakly prime, because it can be changed into another prime (12124117961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6062058960 + 6062058961.

It is an arithmetic number, because the mean of its divisors is an integer number (6062058961).

Almost surely, 2^12124117921 is an apocalyptic number.

It is an amenable number.

12124117921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12124117921 is an equidigital number, since it uses as much as digits as its factorization.

12124117921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

It can be divided in two parts, 121 and 24117921, that multiplied together give a square (2918268441 = 54021²).

The spelling of 12124117921 in words is "twelve billion, one hundred twenty-four million, one hundred seventeen thousand, nine hundred twenty-one".