21033373 has 4 divisors (see below), whose sum is σ = 21043360. Its totient is φ = 21023388.

The previous prime is 21033371. The next prime is 21033391. The reversal of 21033373 is 37333012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21033373 - 2¹ = 21033371 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 (21033371) 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, 465 + ... + 6502.

It is an arithmetic number, because the mean of its divisors is an integer number (5260840).

Almost surely, 2^21033373 is an apocalyptic number.

It is an amenable number.

21033373 is a deficient number, since it is larger than the sum of its proper divisors (9987).

21033373 is an equidigital number, since it uses as much as digits as its factorization.

21033373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9986.

The product of its (nonzero) digits is 1134, while the sum is 22.

The square root of 21033373 is about 4586.2155422527. The cubic root of 21033373 is about 276.0384888213.

Adding to 21033373 its reverse (37333012), we get a palindrome (58366385).

It can be divided in two parts, 2103 and 3373, that added together give a square (5476 = 74²).

The spelling of 21033373 in words is "twenty-one million, thirty-three thousand, three hundred seventy-three".