11211561055 has 8 divisors (see below), whose sum is σ = 13587080544. Its totient is φ = 8880444000.

The previous prime is 11211561041. The next prime is 11211561073. The reversal of 11211561055 is 55016511211.

11211561055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11211561055 - 2⁹ = 11211560543 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 11100051 + ... + 11101060.

It is an arithmetic number, because the mean of its divisors is an integer number (1698385068).

Almost surely, 2^11211561055 is an apocalyptic number.

11211561055 is a deficient number, since it is larger than the sum of its proper divisors (2375519489).

11211561055 is a wasteful number, since it uses less digits than its factorization.

11211561055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22201217.

The product of its (nonzero) digits is 1500, while the sum is 28.

It can be divided in two parts, 1121156 and 1055, that added together give a palindrome (1122211).

The spelling of 11211561055 in words is "eleven billion, two hundred eleven million, five hundred sixty-one thousand, fifty-five".