21210304330 has 8 divisors (see below), whose sum is σ = 38178547812. Its totient is φ = 8484121728.

The previous prime is 21210304321. The next prime is 21210304343. The reversal of 21210304330 is 3340301212.

It can be written as a sum of positive squares in 2 ways, for example, as 18375700249 + 2834604081 = 135557^2 + 53241^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21210304298 and 21210304307.

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, 1060515207 + ... + 1060515226.

Almost surely, 2^21210304330 is an apocalyptic number.

21210304330 is a deficient number, since it is larger than the sum of its proper divisors (16968243482).

21210304330 is a wasteful number, since it uses less digits than its factorization.

21210304330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121030440.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21210304330 its reverse (3340301212), we get a palindrome (24550605542).

The spelling of 21210304330 in words is "twenty-one billion, two hundred ten million, three hundred four thousand, three hundred thirty".