21312312143 has 2 divisors, whose sum is σ = 21312312144. Its totient is φ = 21312312142.

The previous prime is 21312312101. The next prime is 21312312163. The reversal of 21312312143 is 34121321312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21312312143 - 2¹⁶ = 21312246607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312312163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656156071 + 10656156072.

It is an arithmetic number, because the mean of its divisors is an integer number (10656156072).

Almost surely, 2^21312312143 is an apocalyptic number.

21312312143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312312143 is an equidigital number, since it uses as much as digits as its factorization.

21312312143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 21312312143 its reverse (34121321312), we get a palindrome (55433633455).

The spelling of 21312312143 in words is "twenty-one billion, three hundred twelve million, three hundred twelve thousand, one hundred forty-three".