21043400330 has 8 divisors (see below), whose sum is σ = 37878120612. Its totient is φ = 8417360128.

The previous prime is 21043400321. The next prime is 21043400369. The reversal of 21043400330 is 3300434012.

It can be written as a sum of positive squares in 2 ways, for example, as 18370820521 + 2672579809 = 135539^2 + 51697^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052170007 + ... + 1052170026.

Almost surely, 2^21043400330 is an apocalyptic number.

21043400330 is a deficient number, since it is larger than the sum of its proper divisors (16834720282).

21043400330 is a wasteful number, since it uses less digits than its factorization.

21043400330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104340040.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21043400330 its reverse (3300434012), we get a palindrome (24343834342).

The spelling of 21043400330 in words is "twenty-one billion, forty-three million, four hundred thousand, three hundred thirty".