20021100109177 has 2 divisors, whose sum is σ = 20021100109178. Its totient is φ = 20021100109176.

The previous prime is 20021100109141. The next prime is 20021100109207. The reversal of 20021100109177 is 77190100112002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19134421752681 + 886678356496 = 4374291^2 + 941636^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021100109177 - 2¹⁵ = 20021100076409 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021100109117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010550054588 + 10010550054589.

It is an arithmetic number, because the mean of its divisors is an integer number (10010550054589).

Almost surely, 2^{20021100109177} is an apocalyptic number.

It is an amenable number.

20021100109177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021100109177 is an equidigital number, since it uses as much as digits as its factorization.

20021100109177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 31.

The spelling of 20021100109177 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred nine thousand, one hundred seventy-seven".