21113342231 has 2 divisors, whose sum is σ = 21113342232. Its totient is φ = 21113342230.

The previous prime is 21113342213. The next prime is 21113342339. The reversal of 21113342231 is 13224331112.

Together with previous prime (21113342213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21113342231 - 2³⁰ = 20039600407 is a prime.

It is a super-2 number, since 2×21113342231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21113342197 and 21113342206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113347231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556671115 + 10556671116.

It is an arithmetic number, because the mean of its divisors is an integer number (10556671116).

Almost surely, 2^21113342231 is an apocalyptic number.

21113342231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113342231 is an equidigital number, since it uses as much as digits as its factorization.

21113342231 is an evil number, because the sum of its binary digits is even.

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

Adding to 21113342231 its reverse (13224331112), we get a palindrome (34337673343).

The spelling of 21113342231 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-two thousand, two hundred thirty-one".