21443711 has 2 divisors, whose sum is σ = 21443712. Its totient is φ = 21443710.

The previous prime is 21443707. The next prime is 21443717. The reversal of 21443711 is 11734412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21443711 - 2² = 21443707 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 (21443717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721855 + 10721856.

It is an arithmetic number, because the mean of its divisors is an integer number (10721856).

Almost surely, 2^21443711 is an apocalyptic number.

21443711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443711 is an equidigital number, since it uses as much as digits as its factorization.

21443711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 21443711 is about 4630.7354707433. The cubic root of 21443711 is about 277.8220096616.

The spelling of 21443711 in words is "twenty-one million, four hundred forty-three thousand, seven hundred eleven".