111020121011 has 4 divisors (see below), whose sum is σ = 112002600072. Its totient is φ = 110037641952.

The previous prime is 111020120971. The next prime is 111020121133. The reversal of 111020121011 is 110121020111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111020121011 - 2¹⁸ = 111019858867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111020120983 and 111020121001.

It is not an unprimeable number, because it can be changed into a prime (111020124011) 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, 491239361 + ... + 491239586.

It is an arithmetic number, because the mean of its divisors is an integer number (28000650018).

Almost surely, 2^111020121011 is an apocalyptic number.

111020121011 is a deficient number, since it is larger than the sum of its proper divisors (982479061).

111020121011 is an equidigital number, since it uses as much as digits as its factorization.

111020121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982479060.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111020121011 its reverse (110121020111), we get a palindrome (221141141122).

The spelling of 111020121011 in words is "one hundred eleven billion, twenty million, one hundred twenty-one thousand, eleven".