21153324255 has 96 divisors (see below), whose sum is σ = 39940401600. Its totient is φ = 9531260928.

The previous prime is 21153324223. The next prime is 21153324259. The reversal of 21153324255 is 55242335112.

It is not a de Polignac number, because 21153324255 - 2⁵ = 21153324223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153324259) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18345759 + ... + 18346911.

It is an arithmetic number, because the mean of its divisors is an integer number (416045850).

Almost surely, 2^21153324255 is an apocalyptic number.

21153324255 is a deficient number, since it is larger than the sum of its proper divisors (18787077345).

21153324255 is a wasteful number, since it uses less digits than its factorization.

21153324255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513 (or 1506 counting only the distinct ones).

The product of its digits is 36000, while the sum is 33.

Adding to 21153324255 its reverse (55242335112), we get a palindrome (76395659367).

The spelling of 21153324255 in words is "twenty-one billion, one hundred fifty-three million, three hundred twenty-four thousand, two hundred fifty-five".