11211201555 has 16 divisors (see below), whose sum is σ = 17939399424. Its totient is φ = 5978815200.

The previous prime is 11211201467. The next prime is 11211201571. The reversal of 11211201555 is 55510211211.

11211201555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11211201555 - 2¹⁴ = 11211185171 is a prime.

It is an unprimeable number.

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, 227322 + ... + 272208.

It is an arithmetic number, because the mean of its divisors is an integer number (1121212464).

Almost surely, 2^11211201555 is an apocalyptic number.

11211201555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11211201555 is a deficient number, since it is larger than the sum of its proper divisors (6728197869).

11211201555 is a wasteful number, since it uses less digits than its factorization.

11211201555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61546.

The product of its (nonzero) digits is 500, while the sum is 24.

Adding to 11211201555 its reverse (55510211211), we get a palindrome (66721412766).

The spelling of 11211201555 in words is "eleven billion, two hundred eleven million, two hundred one thousand, five hundred fifty-five".