21075441 has 8 divisors (see below), whose sum is σ = 28126464. Its totient is φ = 14037360.

The previous prime is 21075437. The next prime is 21075451. The reversal of 21075441 is 14457012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21075441 - 2² = 21075437 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21075401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1600 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (3515808).

Almost surely, 2^21075441 is an apocalyptic number.

It is an amenable number.

21075441 is a deficient number, since it is larger than the sum of its proper divisors (7051023).

21075441 is a wasteful number, since it uses less digits than its factorization.

21075441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6471.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 21075441 is about 4590.7996035549. The cubic root of 21075441 is about 276.2223974113. Note that the first 3 decimals are identical.

The spelling of 21075441 in words is "twenty-one million, seventy-five thousand, four hundred forty-one".