111142123440 has 80 divisors (see below), whose sum is σ = 344705366016. Its totient is φ = 29623724800.

The previous prime is 111142123429. The next prime is 111142123447. The reversal of 111142123440 is 44321241111.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 111142123440.

It is not an unprimeable number, because it can be changed into a prime (111142123447) 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, 396955 + ... + 616325.

Almost surely, 2^111142123440 is an apocalyptic number.

111142123440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111142123440 is an abundant number, since it is smaller than the sum of its proper divisors (233563242576).

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

111142123440 is a wasteful number, since it uses less digits than its factorization.

111142123440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221498 (or 221492 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 111142123440 its reverse (44321241111), we get a palindrome (155463364551).

The spelling of 111142123440 in words is "one hundred eleven billion, one hundred forty-two million, one hundred twenty-three thousand, four hundred forty".