21130023330 has 48 divisors (see below), whose sum is σ = 59164068600. Its totient is φ = 5201236224.

The previous prime is 21130023323. The next prime is 21130023331. The reversal of 21130023330 is 3332003112.

21130023330 is a `hidden beast` number, since 2 + 11 + 300 + 23 + 330 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8670775689 + 12459247641 = 93117^2 + 111621^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21130023331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9028755 + ... + 9031094.

Almost surely, 2^21130023330 is an apocalyptic number.

21130023330 is an abundant number, since it is smaller than the sum of its proper divisors (38034045270).

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

21130023330 is a wasteful number, since it uses less digits than its factorization.

21130023330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18059875 (or 18059872 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21130023330 its reverse (3332003112), we get a palindrome (24462026442).

The spelling of 21130023330 in words is "twenty-one billion, one hundred thirty million, twenty-three thousand, three hundred thirty".