11055211021 has 4 divisors (see below), whose sum is σ = 11056798012. Its totient is φ = 11053624032.

The previous prime is 11055210997. The next prime is 11055211051. The reversal of 11055211021 is 12011255011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12011255011 = 7 ⋅1715893573.

It can be written as a sum of positive squares in 2 ways, for example, as 1668314025 + 9386896996 = 40845^2 + 96886^2 .

It is a cyclic number.

It is not a de Polignac number, because 11055211021 - 2⁵ = 11055210989 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 11055211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11055211051) 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, 783000 + ... + 796993.

It is an arithmetic number, because the mean of its divisors is an integer number (2764199503).

Almost surely, 2^11055211021 is an apocalyptic number.

It is an amenable number.

11055211021 is a deficient number, since it is larger than the sum of its proper divisors (1586991).

11055211021 is an equidigital number, since it uses as much as digits as its factorization.

11055211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586990.

The product of its (nonzero) digits is 100, while the sum is 19.

Adding to 11055211021 its reverse (12011255011), we get a palindrome (23066466032).

The spelling of 11055211021 in words is "eleven billion, fifty-five million, two hundred eleven thousand, twenty-one".