21313033 has 8 divisors (see below), whose sum is σ = 24405120. Its totient is φ = 18232800.

The previous prime is 21313021. The next prime is 21313037. The reversal of 21313033 is 33031312.

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 21313033 - 2⁵ = 21313001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312998 and 21313016.

It is not an unprimeable number, because it can be changed into a prime (21313037) 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, 1308 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (3050640).

Almost surely, 2^21313033 is an apocalyptic number.

It is an amenable number.

21313033 is a deficient number, since it is larger than the sum of its proper divisors (3092087).

21313033 is an equidigital number, since it uses as much as digits as its factorization.

21313033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5927.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 21313033 is about 4616.6040549304. The cubic root of 21313033 is about 277.2565101653.

Adding to 21313033 its reverse (33031312), we get a palindrome (54344345).

The spelling of 21313033 in words is "twenty-one million, three hundred thirteen thousand, thirty-three".