21313231343 has 2 divisors, whose sum is σ = 21313231344. Its totient is φ = 21313231342.

The previous prime is 21313231309. The next prime is 21313231367. The reversal of 21313231343 is 34313231312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21313231343 - 2²⁰ = 21312182767 is a prime.

It is a super-3 number, since 3×21313231343³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313233343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656615671 + 10656615672.

It is an arithmetic number, because the mean of its divisors is an integer number (10656615672).

Almost surely, 2^21313231343 is an apocalyptic number.

21313231343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313231343 is an equidigital number, since it uses as much as digits as its factorization.

21313231343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 26.

Adding to 21313231343 its reverse (34313231312), we get a palindrome (55626462655).

The spelling of 21313231343 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty-one thousand, three hundred forty-three".