21530444332 has 6 divisors (see below), whose sum is σ = 37678277588. Its totient is φ = 10765222164.

The previous prime is 21530444329. The next prime is 21530444333. The reversal of 21530444332 is 23344403512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21530444294 and 21530444303.

It is not an unprimeable number, because it can be changed into a prime (21530444333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2691305538 + ... + 2691305545.

Almost surely, 2^21530444332 is an apocalyptic number.

It is an amenable number.

21530444332 is a deficient number, since it is larger than the sum of its proper divisors (16147833256).

21530444332 is a wasteful number, since it uses less digits than its factorization.

21530444332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382611087 (or 5382611085 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 21530444332 its reverse (23344403512), we get a palindrome (44874847844).

The spelling of 21530444332 in words is "twenty-one billion, five hundred thirty million, four hundred forty-four thousand, three hundred thirty-two".