21343233143 has 4 divisors (see below), whose sum is σ = 21920077320. Its totient is φ = 20766388968.

The previous prime is 21343233139. The next prime is 21343233167. The reversal of 21343233143 is 34133234312.

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

It is a cyclic number.

It is not a de Polignac number, because 21343233143 - 2² = 21343233139 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 (21343233103) 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, 288422033 + ... + 288422106.

It is an arithmetic number, because the mean of its divisors is an integer number (5480019330).

Almost surely, 2^21343233143 is an apocalyptic number.

21343233143 is a deficient number, since it is larger than the sum of its proper divisors (576844177).

21343233143 is an equidigital number, since it uses as much as digits as its factorization.

21343233143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576844176.

The product of its digits is 15552, while the sum is 29.

Adding to 21343233143 its reverse (34133234312), we get a palindrome (55476467455).

The spelling of 21343233143 in words is "twenty-one billion, three hundred forty-three million, two hundred thirty-three thousand, one hundred forty-three".