21232100255 has 16 divisors (see below), whose sum is σ = 25603581600. Its totient is φ = 16902387840.

The previous prime is 21232100251. The next prime is 21232100257. The reversal of 21232100255 is 55200123212.

It is not a de Polignac number, because 21232100255 - 2² = 21232100251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21232100255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232100251) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2811785 + ... + 2819325.

It is an arithmetic number, because the mean of its divisors is an integer number (1600223850).

Almost surely, 2^21232100255 is an apocalyptic number.

21232100255 is a deficient number, since it is larger than the sum of its proper divisors (4371481345).

21232100255 is a wasteful number, since it uses less digits than its factorization.

21232100255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10234.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21232100255 its reverse (55200123212), we get a palindrome (76432223467).

The spelling of 21232100255 in words is "twenty-one billion, two hundred thirty-two million, one hundred thousand, two hundred fifty-five".