21552251332 has 12 divisors (see below), whose sum is σ = 38193863680. Its totient is φ = 10639718856.

The previous prime is 21552251317. The next prime is 21552251339. The reversal of 21552251332 is 23315225512.

It is a junction number, because it is equal to n+sod(n) for n = 21552251294 and 21552251303.

It is not an unprimeable number, because it can be changed into a prime (21552251339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34101348 + ... + 34101979.

Almost surely, 2^21552251332 is an apocalyptic number.

It is an amenable number.

21552251332 is a deficient number, since it is larger than the sum of its proper divisors (16641612348).

21552251332 is a wasteful number, since it uses less digits than its factorization.

21552251332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68203410 (or 68203408 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

Adding to 21552251332 its reverse (23315225512), we get a palindrome (44867476844).

The spelling of 21552251332 in words is "twenty-one billion, five hundred fifty-two million, two hundred fifty-one thousand, three hundred thirty-two".