11202121120021 has 4 divisors (see below), whose sum is σ = 12063822744652. Its totient is φ = 10340419495392.

The previous prime is 11202121119989. The next prime is 11202121120123. The reversal of 11202121120021 is 12002112120211.

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 6027815535921 + 5174305584100 = 2455161^2 + 2274710^2 .

It is a cyclic number.

It is not a de Polignac number, because 11202121120021 - 2⁵ = 11202121119989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11202121119977 and 11202121120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11202121120721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430850812296 + ... + 430850812321.

It is an arithmetic number, because the mean of its divisors is an integer number (3015955686163).

Almost surely, 2^{11202121120021} is an apocalyptic number.

It is an amenable number.

11202121120021 is a deficient number, since it is larger than the sum of its proper divisors (861701624631).

11202121120021 is an equidigital number, since it uses as much as digits as its factorization.

11202121120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861701624630.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11202121120021 its reverse (12002112120211), we get a palindrome (23204233240232).

The spelling of 11202121120021 in words is "eleven trillion, two hundred two billion, one hundred twenty-one million, one hundred twenty thousand, twenty-one".