11121221200021 has 8 divisors (see below), whose sum is σ = 11273813642880. Its totient is φ = 10968924194592.

The previous prime is 11121221200007. The next prime is 11121221200049. The reversal of 11121221200021 is 12000212212111.

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

It is a cyclic number.

It is not a de Polignac number, because 11121221200021 - 2¹⁵ = 11121221167253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121221199968 and 11121221200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121221200421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73783555 + ... + 73934128.

It is an arithmetic number, because the mean of its divisors is an integer number (1409226705360).

Almost surely, 2^{11121221200021} is an apocalyptic number.

It is an amenable number.

11121221200021 is a deficient number, since it is larger than the sum of its proper divisors (152592442859).

11121221200021 is an equidigital number, since it uses as much as digits as its factorization.

11121221200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147718715.

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

Adding to 11121221200021 its reverse (12000212212111), we get a palindrome (23121433412132).

The spelling of 11121221200021 in words is "eleven trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, twenty-one".