11122222121000 has 128 divisors (see below), whose sum is σ = 26178209890560. Its totient is φ = 4422885984000.

The previous prime is 11122222120991. The next prime is 11122222121057. The reversal of 11122222121000 is 12122222111.

It is a self number, because there is not a number n which added to its sum of digits gives 11122222121000.

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, 699195047 + ... + 699210953.

It is an arithmetic number, because the mean of its divisors is an integer number (204517264770).

Almost surely, 2^{11122222121000} is an apocalyptic number.

11122222121000 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 11122222121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13089104945280).

11122222121000 is an abundant number, since it is smaller than the sum of its proper divisors (15055987769560).

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

11122222121000 is a wasteful number, since it uses less digits than its factorization.

11122222121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19972 (or 19958 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11122222121000 its reverse (12122222111), we get a palindrome (11134344343111).

The spelling of 11122222121000 in words is "eleven trillion, one hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-one thousand".