21533340322 has 16 divisors (see below), whose sum is σ = 34806313080. Its totient is φ = 9932268672.

The previous prime is 21533340307. The next prime is 21533340331. The reversal of 21533340322 is 22304333512.

It can be written as a sum of positive squares in 4 ways, for example, as 21483058041 + 50282281 = 146571^2 + 7091^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215533 + ... + 299200.

Almost surely, 2^21533340322 is an apocalyptic number.

21533340322 is a deficient number, since it is larger than the sum of its proper divisors (13272972758).

21533340322 is a wasteful number, since it uses less digits than its factorization.

21533340322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516357.

The product of its (nonzero) digits is 12960, while the sum is 28.

Adding to 21533340322 its reverse (22304333512), we get a palindrome (43837673834).

The spelling of 21533340322 in words is "twenty-one billion, five hundred thirty-three million, three hundred forty thousand, three hundred twenty-two".