21136334143 has 4 divisors (see below), whose sum is σ = 21140320680. Its totient is φ = 21132347608.

The previous prime is 21136334129. The next prime is 21136334147. The reversal of 21136334143 is 34143363112.

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-21136334143 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 (21136334147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985305 + ... + 1995922.

It is an arithmetic number, because the mean of its divisors is an integer number (5285080170).

Almost surely, 2^21136334143 is an apocalyptic number.

21136334143 is a deficient number, since it is larger than the sum of its proper divisors (3986537).

21136334143 is an equidigital number, since it uses as much as digits as its factorization.

21136334143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986536.

The product of its digits is 15552, while the sum is 31.

Adding to 21136334143 its reverse (34143363112), we get a palindrome (55279697255).

The spelling of 21136334143 in words is "twenty-one billion, one hundred thirty-six million, three hundred thirty-four thousand, one hundred forty-three".