21122503399177 has 2 divisors, whose sum is σ = 21122503399178. Its totient is φ = 21122503399176.

The previous prime is 21122503399157. The next prime is 21122503399189. The reversal of 21122503399177 is 77199330522112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20788894346256 + 333609052921 = 4559484^2 + 577589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122503399177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21122503399157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561251699588 + 10561251699589.

It is an arithmetic number, because the mean of its divisors is an integer number (10561251699589).

Almost surely, 2^{21122503399177} is an apocalyptic number.

It is an amenable number.

21122503399177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122503399177 is an equidigital number, since it uses as much as digits as its factorization.

21122503399177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The spelling of 21122503399177 in words is "twenty-one trillion, one hundred twenty-two billion, five hundred three million, three hundred ninety-nine thousand, one hundred seventy-seven".