21100122222173 has 2 divisors, whose sum is σ = 21100122222174. Its totient is φ = 21100122222172.

The previous prime is 21100122222149. The next prime is 21100122222197. The reversal of 21100122222173 is 37122222100112.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21100122222149) and next prime (21100122222197).

It can be written as a sum of positive squares in only one way, i.e., 19727339753209 + 1372782468964 = 4441547^2 + 1171658^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100122222173 - 2²⁰ = 21100121173597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100122222373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550061111086 + 10550061111087.

It is an arithmetic number, because the mean of its divisors is an integer number (10550061111087).

Almost surely, 2^{21100122222173} is an apocalyptic number.

It is an amenable number.

21100122222173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100122222173 is an equidigital number, since it uses as much as digits as its factorization.

21100122222173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21100122222173 its reverse (37122222100112), we get a palindrome (58222344322285).

The spelling of 21100122222173 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred seventy-three".