21432302231 has 2 divisors, whose sum is σ = 21432302232. Its totient is φ = 21432302230.

The previous prime is 21432302191. The next prime is 21432302261. The reversal of 21432302231 is 13220323412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21432302231 is a prime.

It is a super-2 number, since 2×21432302231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21432302197 and 21432302206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21432302261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716151115 + 10716151116.

It is an arithmetic number, because the mean of its divisors is an integer number (10716151116).

Almost surely, 2^21432302231 is an apocalyptic number.

21432302231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432302231 is an equidigital number, since it uses as much as digits as its factorization.

21432302231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21432302231 its reverse (13220323412), we get a palindrome (34652625643).

The spelling of 21432302231 in words is "twenty-one billion, four hundred thirty-two million, three hundred two thousand, two hundred thirty-one".