2021166480791 has 2 divisors, whose sum is σ = 2021166480792. Its totient is φ = 2021166480790.

The previous prime is 2021166480787. The next prime is 2021166480863. The reversal of 2021166480791 is 1970846611202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021166480791 - 2² = 2021166480787 is a prime.

It is a super-2 number, since 2×2021166480791² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021166482791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010583240395 + 1010583240396.

It is an arithmetic number, because the mean of its divisors is an integer number (1010583240396).

Almost surely, 2^{2021166480791} is an apocalyptic number.

2021166480791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021166480791 is an equidigital number, since it uses as much as digits as its factorization.

2021166480791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 2021166480791 in words is "two trillion, twenty-one billion, one hundred sixty-six million, four hundred eighty thousand, seven hundred ninety-one".