21255332552 has 32 divisors (see below), whose sum is σ = 40363505280. Its totient is φ = 10491919680.

The previous prime is 21255332531. The next prime is 21255332561. The reversal of 21255332552 is 25523355212.

It is a super-2 number, since 2×21255332552² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 953777 + ... + 975807.

It is an arithmetic number, because the mean of its divisors is an integer number (1261359540).

Almost surely, 2^21255332552 is an apocalyptic number.

It is an amenable number.

21255332552 is a deficient number, since it is larger than the sum of its proper divisors (19108172728).

21255332552 is a wasteful number, since it uses less digits than its factorization.

21255332552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23573 (or 23569 counting only the distinct ones).

The product of its digits is 90000, while the sum is 35.

Adding to 21255332552 its reverse (25523355212), we get a palindrome (46778687764).

The spelling of 21255332552 in words is "twenty-one billion, two hundred fifty-five million, three hundred thirty-two thousand, five hundred fifty-two".