2121120011873 has 2 divisors, whose sum is σ = 2121120011874. Its totient is φ = 2121120011872.

The previous prime is 2121120011863. The next prime is 2121120011903. The reversal of 2121120011873 is 3781100211212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2105845029409 + 15274982464 = 1451153^2 + 123592^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121120011873 - 2³⁸ = 1846242104929 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121120011863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060560005936 + 1060560005937.

It is an arithmetic number, because the mean of its divisors is an integer number (1060560005937).

Almost surely, 2^{2121120011873} is an apocalyptic number.

It is an amenable number.

2121120011873 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121120011873 is an equidigital number, since it uses as much as digits as its factorization.

2121120011873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 29.

The spelling of 2121120011873 in words is "two trillion, one hundred twenty-one billion, one hundred twenty million, eleven thousand, eight hundred seventy-three".