21310033 has 8 divisors (see below), whose sum is σ = 21751200. Its totient is φ = 20871648.

The previous prime is 21310021. The next prime is 21310043. The reversal of 21310033 is 33001312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21310033 is a prime.

It is a super-2 number, since 2×21310033² = 908235012922178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21309995 and 21310022.

It is not an unprimeable number, because it can be changed into a prime (21310043) 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, 21885 + ... + 22837.

It is an arithmetic number, because the mean of its divisors is an integer number (2718900).

Almost surely, 2^21310033 is an apocalyptic number.

It is an amenable number.

21310033 is a deficient number, since it is larger than the sum of its proper divisors (441167).

21310033 is an equidigital number, since it uses as much as digits as its factorization.

21310033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21310033 is about 4616.2791293422. The cubic root of 21310033 is about 277.2435007771.

Adding to 21310033 its reverse (33001312), we get a palindrome (54311345).

The spelling of 21310033 in words is "twenty-one million, three hundred ten thousand, thirty-three".