111213021 has 8 divisors (see below), whose sum is σ = 148733344. Its totient is φ = 73917360.

The previous prime is 111213017. The next prime is 111213041. The reversal of 111213021 is 120312111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111213021 - 2² = 111213017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212988 and 111213006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111213041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55006 + ... + 56991.

It is an arithmetic number, because the mean of its divisors is an integer number (18591668).

Almost surely, 2^111213021 is an apocalyptic number.

It is an amenable number.

111213021 is a deficient number, since it is larger than the sum of its proper divisors (37520323).

111213021 is a wasteful number, since it uses less digits than its factorization.

111213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112331.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 111213021 is about 10545.7584364521. The cubic root of 111213021 is about 480.8967913495.

Adding to 111213021 its reverse (120312111), we get a palindrome (231525132).

The spelling of 111213021 in words is "one hundred eleven million, two hundred thirteen thousand, twenty-one".