21023210330 has 32 divisors (see below), whose sum is σ = 38138352336. Its totient is φ = 8343445504.

The previous prime is 21023210287. The next prime is 21023210333. The reversal of 21023210330 is 3301232012.

It can be written as a sum of positive squares in 8 ways, for example, as 8898337561 + 12124872769 = 94331^2 + 110113^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21023210299 and 21023210308.

It is not an unprimeable number, because it can be changed into a prime (21023210333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3966242 + ... + 3971538.

Almost surely, 2^21023210330 is an apocalyptic number.

21023210330 is a deficient number, since it is larger than the sum of its proper divisors (17115142006).

21023210330 is a wasteful number, since it uses less digits than its factorization.

21023210330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8338.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21023210330 its reverse (3301232012), we get a palindrome (24324442342).

The spelling of 21023210330 in words is "twenty-one billion, twenty-three million, two hundred ten thousand, three hundred thirty".