21192443 has 2 divisors, whose sum is σ = 21192444. Its totient is φ = 21192442.

The previous prime is 21192433. The next prime is 21192481. The reversal of 21192443 is 34429112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21192443 - 2⁴ = 21192427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21192403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10596221 + 10596222.

It is an arithmetic number, because the mean of its divisors is an integer number (10596222).

Almost surely, 2^21192443 is an apocalyptic number.

21192443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21192443 is an equidigital number, since it uses as much as digits as its factorization.

21192443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 21192443 is about 4603.5250623843. The cubic root of 21192443 is about 276.7326113350.

The spelling of 21192443 in words is "twenty-one million, one hundred ninety-two thousand, four hundred forty-three".