21234330 has 48 divisors (see below), whose sum is σ = 59459400. Its totient is φ = 5226624.

The previous prime is 21234307. The next prime is 21234347. The reversal of 21234330 is 3343212.

It can be written as a sum of positive squares in 4 ways, for example, as 10949481 + 10284849 = 3309^2 + 3207^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7905 + ... + 10244.

Almost surely, 2^21234330 is an apocalyptic number.

21234330 is an abundant number, since it is smaller than the sum of its proper divisors (38225070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21234330 is a wasteful number, since it uses less digits than its factorization.

21234330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18175 (or 18172 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21234330 is about 4608.0722650584. The cubic root of 21234330 is about 276.9148126095.

Adding to 21234330 its reverse (3343212), we get a palindrome (24577542).

The spelling of 21234330 in words is "twenty-one million, two hundred thirty-four thousand, three hundred thirty".