21184408810297 has 2 divisors, whose sum is σ = 21184408810298. Its totient is φ = 21184408810296.

The previous prime is 21184408810249. The next prime is 21184408810379. The reversal of 21184408810297 is 79201880448112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21085876228096 + 98532582201 = 4591936^2 + 313899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21184408810297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21184408810217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10592204405148 + 10592204405149.

It is an arithmetic number, because the mean of its divisors is an integer number (10592204405149).

Almost surely, 2^{21184408810297} is an apocalyptic number.

It is an amenable number.

21184408810297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21184408810297 is an equidigital number, since it uses as much as digits as its factorization.

21184408810297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2064384, while the sum is 55.

The spelling of 21184408810297 in words is "twenty-one trillion, one hundred eighty-four billion, four hundred eight million, eight hundred ten thousand, two hundred ninety-seven".