111143021952 has 128 divisors (see below), whose sum is σ = 297480960000. Its totient is φ = 36765425664.

The previous prime is 111143021939. The next prime is 111143021987. The reversal of 111143021952 is 259120341111.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 33086449 + ... + 33089807.

It is an arithmetic number, because the mean of its divisors is an integer number (2324070000).

Almost surely, 2^111143021952 is an apocalyptic number.

111143021952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111143021952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148740480000).

111143021952 is an abundant number, since it is smaller than the sum of its proper divisors (186337938048).

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

111143021952 is a wasteful number, since it uses less digits than its factorization.

111143021952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008 (or 3996 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The spelling of 111143021952 in words is "one hundred eleven billion, one hundred forty-three million, twenty-one thousand, nine hundred fifty-two".