21100443413297 has 2 divisors, whose sum is σ = 21100443413298. Its totient is φ = 21100443413296.

The previous prime is 21100443413237. The next prime is 21100443413311. The reversal of 21100443413297 is 79231434400112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16315589033536 + 4784854379761 = 4039256^2 + 2187431^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100443413297 - 2¹⁴ = 21100443396913 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100443413237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550221706648 + 10550221706649.

It is an arithmetic number, because the mean of its divisors is an integer number (10550221706649).

Almost surely, 2^{21100443413297} is an apocalyptic number.

It is an amenable number.

21100443413297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100443413297 is an equidigital number, since it uses as much as digits as its factorization.

21100443413297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 21100443413297 in words is "twenty-one trillion, one hundred billion, four hundred forty-three million, four hundred thirteen thousand, two hundred ninety-seven".