111020021999 has 4 divisors (see below), whose sum is σ = 111030505200. Its totient is φ = 111009538800.

The previous prime is 111020021939. The next prime is 111020022037. The reversal of 111020021999 is 999120020111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999120020111 = 59 ⋅16934237629.

It is a cyclic number.

It is not a de Polignac number, because 111020021999 - 2⁸ = 111020021743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111020021909) 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, 5225699 + ... + 5246900.

It is an arithmetic number, because the mean of its divisors is an integer number (27757626300).

Almost surely, 2^111020021999 is an apocalyptic number.

111020021999 is a deficient number, since it is larger than the sum of its proper divisors (10483201).

111020021999 is a wasteful number, since it uses less digits than its factorization.

111020021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10483200.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 111020021999 in words is "one hundred eleven billion, twenty million, twenty-one thousand, nine hundred ninety-nine".