21443061 has 16 divisors (see below), whose sum is σ = 30081024. Its totient is φ = 13560624.

The previous prime is 21443053. The next prime is 21443083. The reversal of 21443061 is 16034412.

It is not a de Polignac number, because 21443061 - 2³ = 21443053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7540 + ... + 9986.

It is an arithmetic number, because the mean of its divisors is an integer number (1880064).

Almost surely, 2^21443061 is an apocalyptic number.

It is an amenable number.

21443061 is a deficient number, since it is larger than the sum of its proper divisors (8637963).

21443061 is a wasteful number, since it uses less digits than its factorization.

21443061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21443061 is about 4630.6652869755. The cubic root of 21443061 is about 277.8192025272.

Adding to 21443061 its reverse (16034412), we get a palindrome (37477473).

The spelling of 21443061 in words is "twenty-one million, four hundred forty-three thousand, sixty-one".