21237041 has 12 divisors (see below), whose sum is σ = 26005680. Its totient is φ = 17244360.

The previous prime is 21237031. The next prime is 21237043. The reversal of 21237041 is 14073212.

It is not a de Polignac number, because 21237041 - 2²² = 17042737 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21237043) 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, 10475 + ... + 12336.

It is an arithmetic number, because the mean of its divisors is an integer number (2167140).

Almost surely, 2^21237041 is an apocalyptic number.

It is an amenable number.

21237041 is a deficient number, since it is larger than the sum of its proper divisors (4768639).

21237041 is a wasteful number, since it uses less digits than its factorization.

21237041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22844 (or 22837 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21237041 is about 4608.3664133834. The cubic root of 21237041 is about 276.9265967363.

The spelling of 21237041 in words is "twenty-one million, two hundred thirty-seven thousand, forty-one".