21037163 has 8 divisors (see below), whose sum is σ = 24268032. Its totient is φ = 17862696.

The previous prime is 21037139. The next prime is 21037171. The reversal of 21037163 is 36173012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21037163 - 2¹⁰ = 21036139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21037103) 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, 13295 + ... + 14792.

It is an arithmetic number, because the mean of its divisors is an integer number (3033504).

Almost surely, 2^21037163 is an apocalyptic number.

21037163 is a deficient number, since it is larger than the sum of its proper divisors (3230869).

21037163 is a wasteful number, since it uses less digits than its factorization.

21037163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28201.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 21037163 is about 4586.6287183508. The cubic root of 21037163 is about 276.0550676021.

It can be divided in two parts, 210 and 37163, that added together give a palindrome (37373).

The spelling of 21037163 in words is "twenty-one million, thirty-seven thousand, one hundred sixty-three".