120021011111 has 4 divisors (see below), whose sum is σ = 120027795552. Its totient is φ = 120014226672.

The previous prime is 120021011093. The next prime is 120021011119. The reversal of 120021011111 is 111110120021.

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 120021011111 - 2²² = 120016816807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120021011092 and 120021011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021011119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365615 + ... + 3401088.

It is an arithmetic number, because the mean of its divisors is an integer number (30006948888).

Almost surely, 2^120021011111 is an apocalyptic number.

120021011111 is a deficient number, since it is larger than the sum of its proper divisors (6784441).

120021011111 is an equidigital number, since it uses as much as digits as its factorization.

120021011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6784440.

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

Adding to 120021011111 its reverse (111110120021), we get a palindrome (231131131132).

The spelling of 120021011111 in words is "one hundred twenty billion, twenty-one million, eleven thousand, one hundred eleven".