21417812261099 has 2 divisors, whose sum is σ = 21417812261100. Its totient is φ = 21417812261098.

The previous prime is 21417812261057. The next prime is 21417812261147. The reversal of 21417812261099 is 99016221871412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21417812261099 - 2²⁴ = 21417795483883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21417812261099.

It is not a weakly prime, because it can be changed into another prime (21417812261009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708906130549 + 10708906130550.

It is an arithmetic number, because the mean of its divisors is an integer number (10708906130550).

Almost surely, 2^{21417812261099} is an apocalyptic number.

21417812261099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21417812261099 is an equidigital number, since it uses as much as digits as its factorization.

21417812261099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 21417812261099 in words is "twenty-one trillion, four hundred seventeen billion, eight hundred twelve million, two hundred sixty-one thousand, ninety-nine".