21012233 has 8 divisors (see below), whose sum is σ = 24129120. Its totient is φ = 18096480.

The previous prime is 21012227. The next prime is 21012239. The reversal of 21012233 is 33221012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21012227) and next prime (21012239).

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 21012233 - 2²⁴ = 4235017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012239) 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, 50060 + ... + 50477.

It is an arithmetic number, because the mean of its divisors is an integer number (3016140).

Almost surely, 2^21012233 is an apocalyptic number.

It is an amenable number.

21012233 is a deficient number, since it is larger than the sum of its proper divisors (3116887).

21012233 is a wasteful number, since it uses less digits than its factorization.

21012233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100567.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21012233 is about 4583.9102303601. The cubic root of 21012233 is about 275.9459785400.

Adding to 21012233 its reverse (33221012), we get a palindrome (54233245).

It can be divided in two parts, 2101 and 2233, that added together give a palindrome (4334).

The spelling of 21012233 in words is "twenty-one million, twelve thousand, two hundred thirty-three".