111511423420 has 12 divisors (see below), whose sum is σ = 234173989224. Its totient is φ = 44604569360.

The previous prime is 111511423417. The next prime is 111511423427. The reversal of 111511423420 is 24324115111.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111511423427) 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, 2787785566 + ... + 2787785605.

It is an arithmetic number, because the mean of its divisors is an integer number (19514499102).

Almost surely, 2^111511423420 is an apocalyptic number.

111511423420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111511423420 is an abundant number, since it is smaller than the sum of its proper divisors (122662565804).

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

111511423420 is a wasteful number, since it uses less digits than its factorization.

111511423420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5575571180 (or 5575571178 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 111511423420 its reverse (24324115111), we get a palindrome (135835538531).

The spelling of 111511423420 in words is "one hundred eleven billion, five hundred eleven million, four hundred twenty-three thousand, four hundred twenty".