2021163847957 has 2 divisors, whose sum is σ = 2021163847958. Its totient is φ = 2021163847956.

The previous prime is 2021163847849. The next prime is 2021163847961. The reversal of 2021163847957 is 7597483611202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1898040757636 + 123123090321 = 1377694^2 + 350889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021163847957 - 2²⁷ = 2021029630229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021163847898 and 2021163847907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021163847657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010581923978 + 1010581923979.

It is an arithmetic number, because the mean of its divisors is an integer number (1010581923979).

It is a 1-persistent number, because it is pandigital, but 2⋅2021163847957 = 4042327695914 is not.

Almost surely, 2^{2021163847957} is an apocalyptic number.

It is an amenable number.

2021163847957 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021163847957 is an equidigital number, since it uses as much as digits as its factorization.

2021163847957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 2021163847957 in words is "two trillion, twenty-one billion, one hundred sixty-three million, eight hundred forty-seven thousand, nine hundred fifty-seven".