21311132143 has 8 divisors (see below), whose sum is σ = 24358354560. Its totient is φ = 18264603480.

The previous prime is 21311132137. The next prime is 21311132173. The reversal of 21311132143 is 34123111312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21311132143 - 2⁹ = 21311131631 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 (21311132173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105853 + ... + 232006.

It is an arithmetic number, because the mean of its divisors is an integer number (3044794320).

Almost surely, 2^21311132143 is an apocalyptic number.

21311132143 is a deficient number, since it is larger than the sum of its proper divisors (3047222417).

21311132143 is an equidigital number, since it uses as much as digits as its factorization.

21311132143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346877.

The product of its digits is 432, while the sum is 22.

Adding to 21311132143 its reverse (34123111312), we get a palindrome (55434243455).

The spelling of 21311132143 in words is "twenty-one billion, three hundred eleven million, one hundred thirty-two thousand, one hundred forty-three".