11111001020988 has 24 divisors (see below), whose sum is σ = 28282548053760. Its totient is φ = 3366970006320.

The previous prime is 11111001020887. The next prime is 11111001021007. The reversal of 11111001020988 is 88902010011111.

It is a happy number.

It is a super-2 number, since 2×11111001020988² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 42087124948 + ... + 42087125211.

It is an arithmetic number, because the mean of its divisors is an integer number (1178439502240).

Almost surely, 2^{11111001020988} is an apocalyptic number.

It is an amenable number.

11111001020988 is an abundant number, since it is smaller than the sum of its proper divisors (17171547032772).

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

11111001020988 is a wasteful number, since it uses less digits than its factorization.

11111001020988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84174250177 (or 84174250175 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 33.

The spelling of 11111001020988 in words is "eleven trillion, one hundred eleven billion, one million, twenty thousand, nine hundred eighty-eight".