21273023397599 has 2 divisors, whose sum is σ = 21273023397600. Its totient is φ = 21273023397598.

The previous prime is 21273023397583. The next prime is 21273023397617. The reversal of 21273023397599 is 99579332037212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21273023397599 - 2⁴ = 21273023397583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21273023297599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10636511698799 + 10636511698800.

It is an arithmetic number, because the mean of its divisors is an integer number (10636511698800).

Almost surely, 2^{21273023397599} is an apocalyptic number.

21273023397599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21273023397599 is an equidigital number, since it uses as much as digits as its factorization.

21273023397599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38578680, while the sum is 62.

The spelling of 21273023397599 in words is "twenty-one trillion, two hundred seventy-three billion, twenty-three million, three hundred ninety-seven thousand, five hundred ninety-nine".