2021566758051 has 4 divisors (see below), whose sum is σ = 2695422344072. Its totient is φ = 1347711172032.

The previous prime is 2021566758023. The next prime is 2021566758053. The reversal of 2021566758051 is 1508576651202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2021566758051 - 2⁵ = 2021566758019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021566758053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336927793006 + ... + 336927793011.

It is an arithmetic number, because the mean of its divisors is an integer number (673855586018).

Almost surely, 2^{2021566758051} is an apocalyptic number.

2021566758051 is a deficient number, since it is larger than the sum of its proper divisors (673855586021).

2021566758051 is an equidigital number, since it uses as much as digits as its factorization.

2021566758051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673855586020.

The product of its (nonzero) digits is 1008000, while the sum is 48.

The spelling of 2021566758051 in words is "two trillion, twenty-one billion, five hundred sixty-six million, seven hundred fifty-eight thousand, fifty-one".