21112330 has 16 divisors (see below), whose sum is σ = 38524104. Its totient is φ = 8328960.

The previous prime is 21112291. The next prime is 21112339. The reversal of 21112330 is 3321112.

It can be written as a sum of positive squares in 4 ways, for example, as 19210689 + 1901641 = 4383^2 + 1379^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21112330.

It is not an unprimeable number, because it can be changed into a prime (21112339) 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, 13731 + ... + 15190.

Almost surely, 2^21112330 is an apocalyptic number.

21112330 is a deficient number, since it is larger than the sum of its proper divisors (17411774).

21112330 is a wasteful number, since it uses less digits than its factorization.

21112330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29001.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21112330 is about 4594.8155566900. The cubic root of 21112330 is about 276.3834636931.

Adding to 21112330 its reverse (3321112), we get a palindrome (24433442).

The spelling of 21112330 in words is "twenty-one million, one hundred twelve thousand, three hundred thirty".