11001111099920 has 40 divisors (see below), whose sum is σ = 25577837460504. Its totient is φ = 4400400714752.

The previous prime is 11001111099919. The next prime is 11001111100013. The reversal of 11001111099920 is 2999011110011.

It can be written as a sum of positive squares in 4 ways, for example, as 2936328999184 + 8064782100736 = 1713572^2 + 2839856^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 8123252 + ... + 9380268.

Almost surely, 2^{11001111099920} is an apocalyptic number.

11001111099920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11001111099920 is an abundant number, since it is smaller than the sum of its proper divisors (14576726360584).

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

11001111099920 is a wasteful number, since it uses less digits than its factorization.

11001111099920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366427 (or 1366421 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 35.

The spelling of 11001111099920 in words is "eleven trillion, one billion, one hundred eleven million, ninety-nine thousand, nine hundred twenty".