21100100200169 has 2 divisors, whose sum is σ = 21100100200170. Its totient is φ = 21100100200168.

The previous prime is 21100100200061. The next prime is 21100100200199. The reversal of 21100100200169 is 96100200100112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20481163974544 + 618936225625 = 4525612^2 + 786725^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100100200169 - 2²⁴ = 21100083422953 is a prime.

It is a super-2 number, since 2×21100100200169² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21100100200199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550050100084 + 10550050100085.

It is an arithmetic number, because the mean of its divisors is an integer number (10550050100085).

Almost surely, 2^{21100100200169} is an apocalyptic number.

It is an amenable number.

21100100200169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100100200169 is an equidigital number, since it uses as much as digits as its factorization.

21100100200169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21100100200169 in words is "twenty-one trillion, one hundred billion, one hundred million, two hundred thousand, one hundred sixty-nine".