21846443 has 2 divisors, whose sum is σ = 21846444. Its totient is φ = 21846442.

The previous prime is 21846421. The next prime is 21846457. The reversal of 21846443 is 34464812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21846443 - 2¹² = 21842347 is a prime.

It is not a weakly prime, because it can be changed into another prime (21846463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923221 + 10923222.

It is an arithmetic number, because the mean of its divisors is an integer number (10923222).

Almost surely, 2^21846443 is an apocalyptic number.

21846443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21846443 is an equidigital number, since it uses as much as digits as its factorization.

21846443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 32.

The square root of 21846443 is about 4674.0178647498. The cubic root of 21846443 is about 279.5504819515.

The spelling of 21846443 in words is "twenty-one million, eight hundred forty-six thousand, four hundred forty-three".