2021110839857 has 2 divisors, whose sum is σ = 2021110839858. Its totient is φ = 2021110839856.

The previous prime is 2021110839799. The next prime is 2021110839883. The reversal of 2021110839857 is 7589380111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1971845042176 + 49265797681 = 1404224^2 + 221959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021110839857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021110833857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010555419928 + 1010555419929.

It is an arithmetic number, because the mean of its divisors is an integer number (1010555419929).

Almost surely, 2^{2021110839857} is an apocalyptic number.

It is an amenable number.

2021110839857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021110839857 is an equidigital number, since it uses as much as digits as its factorization.

2021110839857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 2021110839857 in words is "two trillion, twenty-one billion, one hundred ten million, eight hundred thirty-nine thousand, eight hundred fifty-seven".