11111121121000 has 32 divisors (see below), whose sum is σ = 26000023425480. Its totient is φ = 4444448448000.

The previous prime is 11111121120991. The next prime is 11111121121057. The reversal of 11111121121000 is 12112111111.

It can be written as a sum of positive squares in 4 ways, for example, as 2178877114404 + 8932244006596 = 1476102^2 + 2988686^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5555559561 + ... + 5555561560.

Almost surely, 2^{11111121121000} is an apocalyptic number.

11111121121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111121121000 is an abundant number, since it is smaller than the sum of its proper divisors (14888902304480).

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

11111121121000 is a wasteful number, since it uses less digits than its factorization.

11111121121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111121142 (or 11111121128 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11111121121000 its reverse (12112111111), we get a palindrome (11123233232111).

The spelling of 11111121121000 in words is "eleven trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand".