111121001010 has 384 divisors, whose sum is σ = 320534323200. Its totient is φ = 27639760896.

The previous prime is 111121000967. The next prime is 111121001021. The reversal of 111121001010 is 10100121111.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 111121000983 and 111121001001.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 558396891 + ... + 558397089.

It is an arithmetic number, because the mean of its divisors is an integer number (834724800).

Almost surely, 2^111121001010 is an apocalyptic number.

111121001010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111121001010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160267161600).

111121001010 is an abundant number, since it is smaller than the sum of its proper divisors (209413322190).

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

111121001010 is a wasteful number, since it uses less digits than its factorization.

111121001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 111121001010 its reverse (10100121111), we get a palindrome (121221122121).

The spelling of 111121001010 in words is "one hundred eleven billion, one hundred twenty-one million, one thousand, ten".