111120020021 has 4 divisors (see below), whose sum is σ = 111210289344. Its totient is φ = 111029750700.

The previous prime is 111120020009. The next prime is 111120020023. The reversal of 111120020021 is 120020021111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120020021111 = 1153 ⋅104093687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111120020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111120019984 and 111120020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120020023) 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, 45132815 + ... + 45135276.

It is an arithmetic number, because the mean of its divisors is an integer number (27802572336).

Almost surely, 2^111120020021 is an apocalyptic number.

It is an amenable number.

111120020021 is a deficient number, since it is larger than the sum of its proper divisors (90269323).

111120020021 is an equidigital number, since it uses as much as digits as its factorization.

111120020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90269322.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111120020021 its reverse (120020021111), we get a palindrome (231140041132).

It can be divided in two parts, 111 and 120020021, that multiplied together give a palindrome (13322222331).

The spelling of 111120020021 in words is "one hundred eleven billion, one hundred twenty million, twenty thousand, twenty-one".