21431114131243 has 2 divisors, whose sum is σ = 21431114131244. Its totient is φ = 21431114131242.

The previous prime is 21431114131223. The next prime is 21431114131267. The reversal of 21431114131243 is 34213141113412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21431114131243 - 2⁹ = 21431114130731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21431114131223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715557065621 + 10715557065622.

It is an arithmetic number, because the mean of its divisors is an integer number (10715557065622).

Almost surely, 2^{21431114131243} is an apocalyptic number.

21431114131243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21431114131243 is an equidigital number, since it uses as much as digits as its factorization.

21431114131243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

Adding to 21431114131243 its reverse (34213141113412), we get a palindrome (55644255244655).

The spelling of 21431114131243 in words is "twenty-one trillion, four hundred thirty-one billion, one hundred fourteen million, one hundred thirty-one thousand, two hundred forty-three".