111213205540 has 24 divisors (see below), whose sum is σ = 233554060152. Its totient is φ = 44484076800.

The previous prime is 111213205513. The next prime is 111213205541. The reversal of 111213205540 is 45502312111.

It can be written as a sum of positive squares in 4 ways, for example, as 23242831936 + 87970373604 = 152456^2 + 296598^2 .

It is not an unprimeable number, because it can be changed into a prime (111213205541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1248982 + ... + 1335058.

It is an arithmetic number, because the mean of its divisors is an integer number (9731419173).

Almost surely, 2^111213205540 is an apocalyptic number.

111213205540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111213205540 is an abundant number, since it is smaller than the sum of its proper divisors (122340854612).

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

111213205540 is a wasteful number, since it uses less digits than its factorization.

111213205540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150687 (or 150685 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 111213205540 its reverse (45502312111), we get a palindrome (156715517651).

The spelling of 111213205540 in words is "one hundred eleven billion, two hundred thirteen million, two hundred five thousand, five hundred forty".