11121216404021 has 4 divisors (see below), whose sum is σ = 11706543583200. Its totient is φ = 10535889224844.

The previous prime is 11121216404009. The next prime is 11121216404027. The reversal of 11121216404021 is 12040461212111.

It is a happy number.

11121216404021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11121216404021 - 2¹⁸ = 11121216141877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121216404027) 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, 292663589561 + ... + 292663589598.

It is an arithmetic number, because the mean of its divisors is an integer number (2926635895800).

Almost surely, 2^{11121216404021} is an apocalyptic number.

It is an amenable number.

11121216404021 is a deficient number, since it is larger than the sum of its proper divisors (585327179179).

11121216404021 is an equidigital number, since it uses as much as digits as its factorization.

11121216404021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585327179178.

The product of its (nonzero) digits is 768, while the sum is 26.

Adding to 11121216404021 its reverse (12040461212111), we get a palindrome (23161677616132).

The spelling of 11121216404021 in words is "eleven trillion, one hundred twenty-one billion, two hundred sixteen million, four hundred four thousand, twenty-one".