21037063 has 4 divisors (see below), whose sum is σ = 21121128. Its totient is φ = 20953000.

The previous prime is 21037061. The next prime is 21037103. The reversal of 21037063 is 36073012.

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

It is a cyclic number.

It is not a de Polignac number, because 21037063 - 2¹ = 21037061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037061) 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, 41656 + ... + 42157.

It is an arithmetic number, because the mean of its divisors is an integer number (5280282).

Almost surely, 2^21037063 is an apocalyptic number.

21037063 is a deficient number, since it is larger than the sum of its proper divisors (84065).

21037063 is an equidigital number, since it uses as much as digits as its factorization.

21037063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84064.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 21037063 is about 4586.6178170848. The cubic root of 21037063 is about 276.0546301928.

It can be divided in two parts, 210 and 37063, that added together give a palindrome (37273).

The spelling of 21037063 in words is "twenty-one million, thirty-seven thousand, sixty-three".