111213421 has 16 divisors (see below), whose sum is σ = 125349120. Its totient is φ = 97799680.

The previous prime is 111213419. The next prime is 111213457. The reversal of 111213421 is 124312111.

It is not a de Polignac number, because 111213421 - 2¹ = 111213419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111213395 and 111213404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111213491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44805 + ... + 47221.

It is an arithmetic number, because the mean of its divisors is an integer number (7834320).

Almost surely, 2^111213421 is an apocalyptic number.

111213421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111213421 is a deficient number, since it is larger than the sum of its proper divisors (14135699).

111213421 is a wasteful number, since it uses less digits than its factorization.

111213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564.

The product of its digits is 48, while the sum is 16.

The square root of 111213421 is about 10545.7774014057. Note that the first 3 decimals coincide. The cubic root of 111213421 is about 480.8973678961.

Adding to 111213421 its reverse (124312111), we get a palindrome (235525532).

The spelling of 111213421 in words is "one hundred eleven million, two hundred thirteen thousand, four hundred twenty-one".