1211321255 has 4 divisors (see below), whose sum is σ = 1453585512. Its totient is φ = 969057000.

The previous prime is 1211321233. The next prime is 1211321263. The reversal of 1211321255 is 5521231121.

1211321255 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-1211321255 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211321255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121132121 + ... + 121132130.

It is an arithmetic number, because the mean of its divisors is an integer number (363396378).

Almost surely, 2^1211321255 is an apocalyptic number.

1211321255 is a deficient number, since it is larger than the sum of its proper divisors (242264257).

1211321255 is an equidigital number, since it uses as much as digits as its factorization.

1211321255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242264256.

The product of its digits is 600, while the sum is 23.

The square root of 1211321255 is about 34804.0407855180. The cubic root of 1211321255 is about 1065.9899558112.

Adding to 1211321255 its reverse (5521231121), we get a palindrome (6732552376).

The spelling of 1211321255 in words is "one billion, two hundred eleven million, three hundred twenty-one thousand, two hundred fifty-five".