21082278599 has 2 divisors, whose sum is σ = 21082278600. Its totient is φ = 21082278598.

The previous prime is 21082278523. The next prime is 21082278617. The reversal of 21082278599 is 99587228012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21082278599 - 2¹² = 21082274503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21082278599.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21082238599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541139299 + 10541139300.

It is an arithmetic number, because the mean of its divisors is an integer number (10541139300).

Almost surely, 2^21082278599 is an apocalyptic number.

21082278599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21082278599 is an equidigital number, since it uses as much as digits as its factorization.

21082278599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 21082278599 in words is "twenty-one billion, eighty-two million, two hundred seventy-eight thousand, five hundred ninety-nine".