111122021000 has 128 divisors (see below), whose sum is σ = 263115216000. Its totient is φ = 43923744000.

The previous prime is 111122020987. The next prime is 111122021057. The reversal of 111122021000 is 120221111.

It is a super-2 number, since 2×111122021000² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31829255 + ... + 31832745.

It is an arithmetic number, because the mean of its divisors is an integer number (2055587625).

Almost surely, 2^111122021000 is an apocalyptic number.

111122021000 is a gapful number since it is divisible by the number (10) 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 111122021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131557608000).

111122021000 is an abundant number, since it is smaller than the sum of its proper divisors (151993195000).

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

111122021000 is a wasteful number, since it uses less digits than its factorization.

111122021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880 (or 3866 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111122021000 its reverse (120221111), we get a palindrome (111242242111).

The spelling of 111122021000 in words is "one hundred eleven billion, one hundred twenty-two million, twenty-one thousand".