21233330 has 16 divisors (see below), whose sum is σ = 38294424. Its totient is φ = 8476800.

The previous prime is 21233321. The next prime is 21233339. The reversal of 21233330 is 3333212.

It is an interprime number because it is at equal distance from previous prime (21233321) and next prime (21233339).

It can be written as a sum of positive squares in 4 ways, for example, as 21003889 + 229441 = 4583^2 + 479^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21233299 and 21233308.

It is not an unprimeable number, because it can be changed into a prime (21233339) 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, 4244 + ... + 7776.

Almost surely, 2^21233330 is an apocalyptic number.

21233330 is a deficient number, since it is larger than the sum of its proper divisors (17061094).

21233330 is a wasteful number, since it uses less digits than its factorization.

21233330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141.

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 21233330 is about 4607.9637585380. The cubic root of 21233330 is about 276.9104655740.

Adding to 21233330 its reverse (3333212), we get a palindrome (24566542).

The spelling of 21233330 in words is "twenty-one million, two hundred thirty-three thousand, three hundred thirty".