21195441 has 12 divisors (see below), whose sum is σ = 30794868. Its totient is φ = 14047584.

The previous prime is 21195437. The next prime is 21195451. The reversal of 21195441 is 14459112.

21195441 is a `hidden beast` number, since 2 + 119 + 544 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7535025 + 13660416 = 2745^2 + 3696^2 .

It is not a de Polignac number, because 21195441 - 2² = 21195437 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21195451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5250 + ... + 8363.

It is an arithmetic number, because the mean of its divisors is an integer number (2566239).

Almost surely, 2^21195441 is an apocalyptic number.

It is an amenable number.

21195441 is a deficient number, since it is larger than the sum of its proper divisors (9599427).

21195441 is a wasteful number, since it uses less digits than its factorization.

21195441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13792 (or 13789 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 21195441 is about 4603.8506709058. The cubic root of 21195441 is about 276.7456600941.

The spelling of 21195441 in words is "twenty-one million, one hundred ninety-five thousand, four hundred forty-one".