11111201120021 has 4 divisors (see below), whose sum is σ = 11369601146112. Its totient is φ = 10852801093932.

The previous prime is 11111201120009. The next prime is 11111201120027. The reversal of 11111201120021 is 12002110211111.

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 11111201120021 - 2³⁸ = 10836323213077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111201119978 and 11111201120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111201120027) 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, 129200012981 + ... + 129200013066.

It is an arithmetic number, because the mean of its divisors is an integer number (2842400286528).

Almost surely, 2^{11111201120021} is an apocalyptic number.

It is an amenable number.

11111201120021 is a deficient number, since it is larger than the sum of its proper divisors (258400026091).

11111201120021 is an equidigital number, since it uses as much as digits as its factorization.

11111201120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258400026090.

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

Adding to 11111201120021 its reverse (12002110211111), we get a palindrome (23113311331132).

The spelling of 11111201120021 in words is "eleven trillion, one hundred eleven billion, two hundred one million, one hundred twenty thousand, twenty-one".