21361027599 has 6 divisors (see below), whose sum is σ = 30854817656. Its totient is φ = 14240685060.

The previous prime is 21361027591. The next prime is 21361027601. The reversal of 21361027599 is 99572016312.

It is a happy number.

21361027599 is a `hidden beast` number, since 2 + 1 + 3 + 610 + 27 + 5 + 9 + 9 = 666.

It is not a de Polignac number, because 21361027599 - 2³ = 21361027591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361027591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1186723747 + ... + 1186723764.

Almost surely, 2^21361027599 is an apocalyptic number.

21361027599 is a deficient number, since it is larger than the sum of its proper divisors (9493790057).

21361027599 is a wasteful number, since it uses less digits than its factorization.

21361027599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373447517 (or 2373447514 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 21361027599 in words is "twenty-one billion, three hundred sixty-one million, twenty-seven thousand, five hundred ninety-nine".