21443119 has 2 divisors, whose sum is σ = 21443120. Its totient is φ = 21443118.

The previous prime is 21443099. The next prime is 21443129. The reversal of 21443119 is 91134412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21443119 - 2⁵ = 21443087 is a prime.

It is a super-2 number, since 2×21443119² = 919614704896322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21443093 and 21443102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21443129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721559 + 10721560.

It is an arithmetic number, because the mean of its divisors is an integer number (10721560).

Almost surely, 2^21443119 is an apocalyptic number.

21443119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443119 is an equidigital number, since it uses as much as digits as its factorization.

21443119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 21443119 is about 4630.6715495703. The cubic root of 21443119 is about 277.8194530123.

The spelling of 21443119 in words is "twenty-one million, four hundred forty-three thousand, one hundred nineteen".