21513233332 has 6 divisors (see below), whose sum is σ = 37648158338. Its totient is φ = 10756616664.

The previous prime is 21513233297. The next prime is 21513233351. The reversal of 21513233332 is 23333231512.

It can be written as a sum of positive squares in only one way, i.e., 20599138576 + 914094756 = 143524^2 + 30234^2 .

It is a super-3 number, since 3×21513233332³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21513233332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2689154163 + ... + 2689154170.

Almost surely, 2^21513233332 is an apocalyptic number.

It is an amenable number.

21513233332 is a deficient number, since it is larger than the sum of its proper divisors (16134925006).

21513233332 is a wasteful number, since it uses less digits than its factorization.

21513233332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5378308337 (or 5378308335 counting only the distinct ones).

The product of its digits is 9720, while the sum is 28.

Adding to 21513233332 its reverse (23333231512), we get a palindrome (44846464844).

The spelling of 21513233332 in words is "twenty-one billion, five hundred thirteen million, two hundred thirty-three thousand, three hundred thirty-two".