21013233 has 8 divisors (see below), whose sum is σ = 28039968. Its totient is φ = 13997664.

The previous prime is 21013217. The next prime is 21013249. The reversal of 21013233 is 33231012.

It is an interprime number because it is at equal distance from previous prime (21013217) and next prime (21013249).

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

It is not a de Polignac number, because 21013233 - 2⁴ = 21013217 is a prime.

It is a super-2 number, since 2×21013233² = 883111922224578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21013273) 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, 3885 + ... + 7557.

It is an arithmetic number, because the mean of its divisors is an integer number (3504996).

Almost surely, 2^21013233 is an apocalyptic number.

It is an amenable number.

21013233 is a deficient number, since it is larger than the sum of its proper divisors (7026735).

21013233 is a wasteful number, since it uses less digits than its factorization.

21013233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5583.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21013233 is about 4584.0193062421. The cubic root of 21013233 is about 275.9503560154.

Adding to 21013233 its reverse (33231012), we get a palindrome (54244245).

The spelling of 21013233 in words is "twenty-one million, thirteen thousand, two hundred thirty-three".