21269041 has 4 divisors (see below), whose sum is σ = 21300084. Its totient is φ = 21238000.

The previous prime is 21269033. The next prime is 21269077. The reversal of 21269041 is 14096212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11029041 + 10240000 = 3321^2 + 3200^2 .

It is a cyclic number.

It is not a de Polignac number, because 21269041 - 2³ = 21269033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21268997 and 21269015.

It is not an unprimeable number, because it can be changed into a prime (21269741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14470 + ... + 15871.

It is an arithmetic number, because the mean of its divisors is an integer number (5325021).

Almost surely, 2^21269041 is an apocalyptic number.

It is an amenable number.

21269041 is a deficient number, since it is larger than the sum of its proper divisors (31043).

21269041 is an equidigital number, since it uses as much as digits as its factorization.

21269041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31042.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21269041 is about 4611.8370526288. The cubic root of 21269041 is about 277.0656180482.

The spelling of 21269041 in words is "twenty-one million, two hundred sixty-nine thousand, forty-one".