1111122120021 has 4 divisors (see below), whose sum is σ = 1481496160032. Its totient is φ = 740748080012.

The previous prime is 1111122120011. The next prime is 1111122120149. The reversal of 1111122120021 is 1200212211111.

It is a happy number.

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 1111122120021 - 2⁶ = 1111122119957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111122120011) 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, 185187020001 + ... + 185187020006.

It is an arithmetic number, because the mean of its divisors is an integer number (370374040008).

Almost surely, 2^{1111122120021} is an apocalyptic number.

It is an amenable number.

1111122120021 is a deficient number, since it is larger than the sum of its proper divisors (370374040011).

1111122120021 is an equidigital number, since it uses as much as digits as its factorization.

1111122120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370374040010.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1111122120021 its reverse (1200212211111), we get a palindrome (2311334331132).

The spelling of 1111122120021 in words is "one trillion, one hundred eleven billion, one hundred twenty-two million, one hundred twenty thousand, twenty-one".