111231420 has 24 divisors (see below), whose sum is σ = 311448144. Its totient is φ = 29661696.

The previous prime is 111231409. The next prime is 111231431. The reversal of 111231420 is 24132111.

It is an interprime number because it is at equal distance from previous prime (111231409) and next prime (111231431).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 111231420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926869 + ... + 926988.

It is an arithmetic number, because the mean of its divisors is an integer number (12977006).

Almost surely, 2^111231420 is an apocalyptic number.

111231420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111231420 is an abundant number, since it is smaller than the sum of its proper divisors (200216724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111231420 is a wasteful number, since it uses less digits than its factorization.

111231420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853869 (or 1853867 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 111231420 is about 10546.6307416160. The cubic root of 111231420 is about 480.9233096237.

Adding to 111231420 its reverse (24132111), we get a palindrome (135363531).

The spelling of 111231420 in words is "one hundred eleven million, two hundred thirty-one thousand, four hundred twenty".