21136313527 has 4 divisors (see below), whose sum is σ = 24155786896. Its totient is φ = 18116840160.

The previous prime is 21136313491. The next prime is 21136313533. The reversal of 21136313527 is 72531363112.

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-21136313527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21136313492 and 21136313501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136313227) 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, 1509736674 + ... + 1509736687.

It is an arithmetic number, because the mean of its divisors is an integer number (6038946724).

Almost surely, 2^21136313527 is an apocalyptic number.

21136313527 is a deficient number, since it is larger than the sum of its proper divisors (3019473369).

21136313527 is an equidigital number, since it uses as much as digits as its factorization.

21136313527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019473368.

The product of its digits is 22680, while the sum is 34.

Adding to 21136313527 its reverse (72531363112), we get a palindrome (93667676639).

The spelling of 21136313527 in words is "twenty-one billion, one hundred thirty-six million, three hundred thirteen thousand, five hundred twenty-seven".