21100223211173 has 2 divisors, whose sum is σ = 21100223211174. Its totient is φ = 21100223211172.

The previous prime is 21100223211149. The next prime is 21100223211191. The reversal of 21100223211173 is 37111232200112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18170244699649 + 2929978511524 = 4262657^2 + 1711718^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100223211173 - 2¹⁶ = 21100223145637 is a prime.

It is a super-2 number, since 2×21100223211173² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100223211073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550111605586 + 10550111605587.

It is an arithmetic number, because the mean of its divisors is an integer number (10550111605587).

Almost surely, 2^{21100223211173} is an apocalyptic number.

It is an amenable number.

21100223211173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100223211173 is an equidigital number, since it uses as much as digits as its factorization.

21100223211173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 21100223211173 its reverse (37111232200112), we get a palindrome (58211455411285).

The spelling of 21100223211173 in words is "twenty-one trillion, one hundred billion, two hundred twenty-three million, two hundred eleven thousand, one hundred seventy-three".