12120863872021 has 2 divisors, whose sum is σ = 12120863872022. Its totient is φ = 12120863872020.

The previous prime is 12120863871967. The next prime is 12120863872079. The reversal of 12120863872021 is 12027836802121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7312097319921 + 4808766552100 = 2704089^2 + 2192890^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120863872021 - 2⁹ = 12120863871509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12120863872081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060431936010 + 6060431936011.

It is an arithmetic number, because the mean of its divisors is an integer number (6060431936011).

Almost surely, 2^{12120863872021} is an apocalyptic number.

It is an amenable number.

12120863872021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120863872021 is an equidigital number, since it uses as much as digits as its factorization.

12120863872021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 12120863872021 in words is "twelve trillion, one hundred twenty billion, eight hundred sixty-three million, eight hundred seventy-two thousand, twenty-one".