11111000120021 has 4 divisors (see below), whose sum is σ = 11112014185932. Its totient is φ = 11109986054112.

The previous prime is 11111000119987. The next prime is 11111000120071. The reversal of 11111000120021 is 12002100011111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7997363417521 + 3113636702500 = 2827961^2 + 1764550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111000120021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11111000119984 and 11111000120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111000120071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507016520 + ... + 507038433.

It is an arithmetic number, because the mean of its divisors is an integer number (2778003546483).

Almost surely, 2^{11111000120021} is an apocalyptic number.

It is an amenable number.

11111000120021 is a deficient number, since it is larger than the sum of its proper divisors (1014065911).

11111000120021 is a wasteful number, since it uses less digits than its factorization.

11111000120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014065910.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11111000120021 its reverse (12002100011111), we get a palindrome (23113100131132).

The spelling of 11111000120021 in words is "eleven trillion, one hundred eleven billion, one hundred twenty thousand, twenty-one".