11001121988 has 6 divisors (see below), whose sum is σ = 19251963486. Its totient is φ = 5500560992.

The previous prime is 11001121979. The next prime is 11001122029. The reversal of 11001121988 is 88912110011.

It can be written as a sum of positive squares in only one way, i.e., 10324185664 + 676936324 = 101608^2 + 26018^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1375140245 + ... + 1375140252.

It is an arithmetic number, because the mean of its divisors is an integer number (3208660581).

Almost surely, 2^11001121988 is an apocalyptic number.

It is an amenable number.

11001121988 is a deficient number, since it is larger than the sum of its proper divisors (8250841498).

11001121988 is a wasteful number, since it uses less digits than its factorization.

11001121988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750280501 (or 2750280499 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 32.

Adding to 11001121988 its reverse (88912110011), we get a palindrome (99913231999).

The spelling of 11001121988 in words is "eleven billion, one million, one hundred twenty-one thousand, nine hundred eighty-eight".