11102221220021 has 4 divisors (see below), whose sum is σ = 11102737120044. Its totient is φ = 11101705320000.

The previous prime is 11102221219919. The next prime is 11102221220023. The reversal of 11102221220021 is 12002212220111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7188372280996 + 3913848939025 = 2681114^2 + 1978345^2 .

It is a cyclic number.

It is not a de Polignac number, because 11102221220021 - 2²² = 11102217025717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11102221220023) 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, 257917730 + ... + 257960771.

It is an arithmetic number, because the mean of its divisors is an integer number (2775684280011).

Almost surely, 2^{11102221220021} is an apocalyptic number.

It is an amenable number.

11102221220021 is a deficient number, since it is larger than the sum of its proper divisors (515900023).

11102221220021 is an equidigital number, since it uses as much as digits as its factorization.

11102221220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515900022.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11102221220021 its reverse (12002212220111), we get a palindrome (23104433440132).

The spelling of 11102221220021 in words is "eleven trillion, one hundred two billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".