111211122440 has 32 divisors (see below), whose sum is σ = 272972756160. Its totient is φ = 40440408000.

The previous prime is 111211122437. The next prime is 111211122469. The reversal of 111211122440 is 44221112111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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, 126375836 + ... + 126376715.

It is an arithmetic number, because the mean of its divisors is an integer number (8530398630).

Almost surely, 2^111211122440 is an apocalyptic number.

111211122440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211122440 is an abundant number, since it is smaller than the sum of its proper divisors (161761633720).

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

111211122440 is a wasteful number, since it uses less digits than its factorization.

111211122440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252752573 (or 252752569 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111211122440 its reverse (44221112111), we get a palindrome (155432234551).

The spelling of 111211122440 in words is "one hundred eleven billion, two hundred eleven million, one hundred twenty-two thousand, four hundred forty".