21103233 has 8 divisors (see below), whose sum is σ = 28824096. Its totient is φ = 13725600.

The previous prime is 21103217. The next prime is 21103241. The reversal of 21103233 is 33230112.

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

It is not a de Polignac number, because 21103233 - 2⁴ = 21103217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21103253) 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, 85663 + ... + 85908.

It is an arithmetic number, because the mean of its divisors is an integer number (3603012).

Almost surely, 2^21103233 is an apocalyptic number.

It is an amenable number.

21103233 is a deficient number, since it is larger than the sum of its proper divisors (7720863).

21103233 is a wasteful number, since it uses less digits than its factorization.

21103233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171615.

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

The square root of 21103233 is about 4593.8255299913. The cubic root of 21103233 is about 276.3437614342.

Adding to 21103233 its reverse (33230112), we get a palindrome (54333345).

The spelling of 21103233 in words is "twenty-one million, one hundred three thousand, two hundred thirty-three".