21200220112177 has 2 divisors, whose sum is σ = 21200220112178. Its totient is φ = 21200220112176.

The previous prime is 21200220112171. The next prime is 21200220112189. The reversal of 21200220112177 is 77121102200212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19415620691856 + 1784599420321 = 4406316^2 + 1335889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200220112177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200220112171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600110056088 + 10600110056089.

It is an arithmetic number, because the mean of its divisors is an integer number (10600110056089).

Almost surely, 2^{21200220112177} is an apocalyptic number.

It is an amenable number.

21200220112177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200220112177 is an equidigital number, since it uses as much as digits as its factorization.

21200220112177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 28.

Adding to 21200220112177 its reverse (77121102200212), we get a palindrome (98321322312389).

The spelling of 21200220112177 in words is "twenty-one trillion, two hundred billion, two hundred twenty million, one hundred twelve thousand, one hundred seventy-seven".