21273637876759 has 4 divisors (see below), whose sum is σ = 21284420259816. Its totient is φ = 21262855493704.

The previous prime is 21273637876717. The next prime is 21273637876769. The reversal of 21273637876759 is 95767873637212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21273637876759 is a prime.

It is a super-2 number, since 2×21273637876759² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21273637876691 and 21273637876700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21273637876769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5391188569 + ... + 5391192514.

It is an arithmetic number, because the mean of its divisors is an integer number (5321105064954).

Almost surely, 2^{21273637876759} is an apocalyptic number.

21273637876759 is a deficient number, since it is larger than the sum of its proper divisors (10782383057).

21273637876759 is a wasteful number, since it uses less digits than its factorization.

21273637876759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10782383056.

The product of its digits is 1120210560, while the sum is 73.

The spelling of 21273637876759 in words is "twenty-one trillion, two hundred seventy-three billion, six hundred thirty-seven million, eight hundred seventy-six thousand, seven hundred fifty-nine".