21443159 has 2 divisors, whose sum is σ = 21443160. Its totient is φ = 21443158.

The previous prime is 21443141. The next prime is 21443167. The reversal of 21443159 is 95134412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21443159 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21443119) 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, 10721579 + 10721580.

It is an arithmetic number, because the mean of its divisors is an integer number (10721580).

Almost surely, 2^21443159 is an apocalyptic number.

21443159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443159 is an equidigital number, since it uses as much as digits as its factorization.

21443159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 21443159 is about 4630.6758685963. The cubic root of 21443159 is about 277.8196257604.

The spelling of 21443159 in words is "twenty-one million, four hundred forty-three thousand, one hundred fifty-nine".