111120000021 has 24 divisors (see below), whose sum is σ = 166690752800. Its totient is φ = 71277234336.

The previous prime is 111119999929. The next prime is 111120000059. The reversal of 111120000021 is 120000021111.

It is a happy number.

It is not a de Polignac number, because 111120000021 - 2¹⁵ = 111119967253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111119999958 and 111120000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120000721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2116846 + ... + 2168703.

Almost surely, 2^111120000021 is an apocalyptic number.

It is an amenable number.

111120000021 is a deficient number, since it is larger than the sum of its proper divisors (55570752779).

111120000021 is a wasteful number, since it uses less digits than its factorization.

111120000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4285665 (or 4285662 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111120000021 its reverse (120000021111), we get a palindrome (231120021132).

It can be divided in two parts, 111 and 120000021, that multiplied together give a palindrome (13320002331).

The spelling of 111120000021 in words is "one hundred eleven billion, one hundred twenty million, twenty-one", and thus it is an aban number.