2121062665867 has 2 divisors, whose sum is σ = 2121062665868. Its totient is φ = 2121062665866.

The previous prime is 2121062665781. The next prime is 2121062665871. The reversal of 2121062665867 is 7685662601212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121062665867 - 2³⁵ = 2086702927499 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121062665367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060531332933 + 1060531332934.

It is an arithmetic number, because the mean of its divisors is an integer number (1060531332934).

Almost surely, 2^{2121062665867} is an apocalyptic number.

2121062665867 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121062665867 is an equidigital number, since it uses as much as digits as its factorization.

2121062665867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 2121062665867 in words is "two trillion, one hundred twenty-one billion, sixty-two million, six hundred sixty-five thousand, eight hundred sixty-seven".