21236000255 has 4 divisors (see below), whose sum is σ = 25483200312. Its totient is φ = 16988800200.

The previous prime is 21236000251. The next prime is 21236000293. The reversal of 21236000255 is 55200063212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21236000255 - 2² = 21236000251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236000251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123600021 + ... + 2123600030.

It is an arithmetic number, because the mean of its divisors is an integer number (6370800078).

Almost surely, 2^21236000255 is an apocalyptic number.

21236000255 is a deficient number, since it is larger than the sum of its proper divisors (4247200057).

21236000255 is an equidigital number, since it uses as much as digits as its factorization.

21236000255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4247200056.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21236000255 its reverse (55200063212), we get a palindrome (76436063467).

The spelling of 21236000255 in words is "twenty-one billion, two hundred thirty-six million, two hundred fifty-five", and thus it is an aban number.