2021111585897 has 2 divisors, whose sum is σ = 2021111585898. Its totient is φ = 2021111585896.

The previous prime is 2021111585879. The next prime is 2021111585929. The reversal of 2021111585897 is 7985851111202.

It is a happy number.

Together with previous prime (2021111585879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1444854484441 + 576257101456 = 1202021^2 + 759116^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021111585897 - 2³² = 2016816618601 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021111585797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010555792948 + 1010555792949.

It is an arithmetic number, because the mean of its divisors is an integer number (1010555792949).

Almost surely, 2^{2021111585897} is an apocalyptic number.

It is an amenable number.

2021111585897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021111585897 is an equidigital number, since it uses as much as digits as its factorization.

2021111585897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 50.

The spelling of 2021111585897 in words is "two trillion, twenty-one billion, one hundred eleven million, five hundred eighty-five thousand, eight hundred ninety-seven".