11112121100021 has 8 divisors (see below), whose sum is σ = 11138422014720. Its totient is φ = 11085830896608.

The previous prime is 11112121100009. The next prime is 11112121100027. The reversal of 11112121100021 is 12000112121111.

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 11112121100021 - 2³⁰ = 11111047358197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11112121099969 and 11112121100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112121100027) 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, 598616 + ... + 4752113.

It is an arithmetic number, because the mean of its divisors is an integer number (1392302751840).

Almost surely, 2^{11112121100021} is an apocalyptic number.

It is an amenable number.

11112121100021 is a deficient number, since it is larger than the sum of its proper divisors (26300914699).

11112121100021 is an equidigital number, since it uses as much as digits as its factorization.

11112121100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355643.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 11112121100021 its reverse (12000112121111), we get a palindrome (23112233221132).

The spelling of 11112121100021 in words is "eleven trillion, one hundred twelve billion, one hundred twenty-one million, one hundred thousand, twenty-one".