2021111585797 has 2 divisors, whose sum is σ = 2021111585798. Its totient is φ = 2021111585796.

The previous prime is 2021111585783. The next prime is 2021111585809. The reversal of 2021111585797 is 7975851111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1872918154116 + 148193431681 = 1368546^2 + 384959^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021111585797 - 2¹¹ = 2021111583749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021111585797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021111585897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010555792898 + 1010555792899.

It is an arithmetic number, because the mean of its divisors is an integer number (1010555792899).

Almost surely, 2^{2021111585797} is an apocalyptic number.

It is an amenable number.

2021111585797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021111585797 is an equidigital number, since it uses as much as digits as its factorization.

2021111585797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 352800, while the sum is 49.

Adding to 2021111585797 its reverse (7975851111202), we get a palindrome (9996962696999).

The spelling of 2021111585797 in words is "two trillion, twenty-one billion, one hundred eleven million, five hundred eighty-five thousand, seven hundred ninety-seven".