21133187759 has 2 divisors, whose sum is σ = 21133187760. Its totient is φ = 21133187758.

The previous prime is 21133187753. The next prime is 21133187791. The reversal of 21133187759 is 95778133112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21133187759 - 2²⁰ = 21132139183 is a prime.

It is a super-2 number, since 2×21133187759² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21133187753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566593879 + 10566593880.

It is an arithmetic number, because the mean of its divisors is an integer number (10566593880).

Almost surely, 2^21133187759 is an apocalyptic number.

21133187759 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133187759 is an equidigital number, since it uses as much as digits as its factorization.

21133187759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 47.

The spelling of 21133187759 in words is "twenty-one billion, one hundred thirty-three million, one hundred eighty-seven thousand, seven hundred fifty-nine".