21073323 has 4 divisors (see below), whose sum is σ = 28097768. Its totient is φ = 14048880.

The previous prime is 21073321. The next prime is 21073363. The reversal of 21073323 is 32337012.

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

It is not a de Polignac number, because 21073323 - 2¹ = 21073321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21073323.

It is not an unprimeable number, because it can be changed into a prime (21073321) 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, 3512218 + ... + 3512223.

It is an arithmetic number, because the mean of its divisors is an integer number (7024442).

Almost surely, 2^21073323 is an apocalyptic number.

21073323 is a deficient number, since it is larger than the sum of its proper divisors (7024445).

21073323 is an equidigital number, since it uses as much as digits as its factorization.

21073323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7024444.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 21073323 is about 4590.5689189903. The cubic root of 21073323 is about 276.2131440085.

The spelling of 21073323 in words is "twenty-one million, seventy-three thousand, three hundred twenty-three".