2101110021977 has 2 divisors, whose sum is σ = 2101110021978. Its totient is φ = 2101110021976.

The previous prime is 2101110021953. The next prime is 2101110022031. The reversal of 2101110021977 is 7791200111012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1508288559376 + 592821462601 = 1228124^2 + 769949^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101110021977 - 2⁸ = 2101110021721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101110021947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050555010988 + 1050555010989.

It is an arithmetic number, because the mean of its divisors is an integer number (1050555010989).

Almost surely, 2^{2101110021977} is an apocalyptic number.

It is an amenable number.

2101110021977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101110021977 is an equidigital number, since it uses as much as digits as its factorization.

2101110021977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 32.

Adding to 2101110021977 its reverse (7791200111012), we get a palindrome (9892310132989).

The spelling of 2101110021977 in words is "two trillion, one hundred one billion, one hundred ten million, twenty-one thousand, nine hundred seventy-seven".