1211263355 has 4 divisors (see below), whose sum is σ = 1453516032. Its totient is φ = 969010680.

The previous prime is 1211263343. The next prime is 1211263393. The reversal of 1211263355 is 5533621121.

1211263355 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, and also an emirpimes, since its reverse is a distinct semiprime: 5533621121 = 7 ⋅790517303.

It is not a de Polignac number, because 1211263355 - 2²⁰ = 1210214779 is a prime.

It is a Duffinian 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, 121126331 + ... + 121126340.

It is an arithmetic number, because the mean of its divisors is an integer number (363379008).

Almost surely, 2^1211263355 is an apocalyptic number.

1211263355 is a deficient number, since it is larger than the sum of its proper divisors (242252677).

1211263355 is an equidigital number, since it uses as much as digits as its factorization.

1211263355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242252676.

The product of its digits is 5400, while the sum is 29.

The square root of 1211263355 is about 34803.2089756103. The cubic root of 1211263355 is about 1065.9729711064.

Adding to 1211263355 its reverse (5533621121), we get a palindrome (6744884476).

The spelling of 1211263355 in words is "one billion, two hundred eleven million, two hundred sixty-three thousand, three hundred fifty-five".