21432443 has 2 divisors, whose sum is σ = 21432444. Its totient is φ = 21432442.

The previous prime is 21432413. The next prime is 21432473. The reversal of 21432443 is 34423412.

It is a balanced prime because it is at equal distance from previous prime (21432413) and next prime (21432473).

It is a cyclic number.

It is not a de Polignac number, because 21432443 - 2¹⁶ = 21366907 is a prime.

It is a super-2 number, since 2×21432443² = 918699225896498, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21432403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716221 + 10716222.

It is an arithmetic number, because the mean of its divisors is an integer number (10716222).

Almost surely, 2^21432443 is an apocalyptic number.

21432443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432443 is an equidigital number, since it uses as much as digits as its factorization.

21432443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 23.

The square root of 21432443 is about 4629.5186574848. The cubic root of 21432443 is about 277.7733388743.

Adding to 21432443 its reverse (34423412), we get a palindrome (55855855).

The spelling of 21432443 in words is "twenty-one million, four hundred thirty-two thousand, four hundred forty-three".