21402477445499 has 2 divisors, whose sum is σ = 21402477445500. Its totient is φ = 21402477445498.

The previous prime is 21402477445477. The next prime is 21402477445511. The reversal of 21402477445499 is 99454477420412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21402477445499 - 2²⁴ = 21402460668283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21402477445439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701238722749 + 10701238722750.

It is an arithmetic number, because the mean of its divisors is an integer number (10701238722750).

Almost surely, 2^{21402477445499} is an apocalyptic number.

21402477445499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402477445499 is an equidigital number, since it uses as much as digits as its factorization.

21402477445499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81285120, while the sum is 62.

The spelling of 21402477445499 in words is "twenty-one trillion, four hundred two billion, four hundred seventy-seven million, four hundred forty-five thousand, four hundred ninety-nine".