2121998013959 has 2 divisors, whose sum is σ = 2121998013960. Its totient is φ = 2121998013958.

The previous prime is 2121998013937. The next prime is 2121998013977. The reversal of 2121998013959 is 9593108991212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121998013959 - 2²⁴ = 2121981236743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121998013898 and 2121998013907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121998043959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060999006979 + 1060999006980.

It is an arithmetic number, because the mean of its divisors is an integer number (1060999006980).

Almost surely, 2^{2121998013959} is an apocalyptic number.

2121998013959 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121998013959 is an equidigital number, since it uses as much as digits as its factorization.

2121998013959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3149280, while the sum is 59.

The spelling of 2121998013959 in words is "two trillion, one hundred twenty-one billion, nine hundred ninety-eight million, thirteen thousand, nine hundred fifty-nine".