11112221121000 has 128 divisors (see below), whose sum is σ = 35476412400000. Its totient is φ = 2894345932800.

The previous prime is 11112221120983. The next prime is 11112221121019. The reversal of 11112221121000 is 12112221111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42941625 + ... + 43199624.

It is an arithmetic number, because the mean of its divisors is an integer number (277159471875).

Almost surely, 2^{11112221121000} is an apocalyptic number.

11112221121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11112221121000 is an abundant number, since it is smaller than the sum of its proper divisors (24364191279000).

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

11112221121000 is a wasteful number, since it uses less digits than its factorization.

11112221121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86141316 (or 86141302 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11112221121000 its reverse (12112221111), we get a palindrome (11124333342111).

The spelling of 11112221121000 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, one hundred twenty-one thousand".