21037259 has 2 divisors, whose sum is σ = 21037260. Its totient is φ = 21037258.

The previous prime is 21037243. The next prime is 21037271. The reversal of 21037259 is 95273012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21037259 - 2⁴ = 21037243 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21037559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518629 + 10518630.

It is an arithmetic number, because the mean of its divisors is an integer number (10518630).

Almost surely, 2^21037259 is an apocalyptic number.

21037259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21037259 is an equidigital number, since it uses as much as digits as its factorization.

21037259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 21037259 is about 4586.6391835417. The cubic root of 21037259 is about 276.0554875137.

The spelling of 21037259 in words is "twenty-one million, thirty-seven thousand, two hundred fifty-nine".