11011111001021 has 4 divisors (see below), whose sum is σ = 11046516502944. Its totient is φ = 10975705499100.

The previous prime is 11011111000987. The next prime is 11011111001053. The reversal of 11011111001021 is 12010011111011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11011111001021 - 2¹⁰ = 11011110999997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011111000993 and 11011111001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011111001321) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 17702750495 + ... + 17702751116.

It is an arithmetic number, because the mean of its divisors is an integer number (2761629125736).

Almost surely, 2^{11011111001021} is an apocalyptic number.

It is an amenable number.

11011111001021 is a deficient number, since it is larger than the sum of its proper divisors (35405501923).

11011111001021 is an equidigital number, since it uses as much as digits as its factorization.

11011111001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35405501922.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11011111001021 its reverse (12010011111011), we get a palindrome (23021122112032).

The spelling of 11011111001021 in words is "eleven trillion, eleven billion, one hundred eleven million, one thousand, twenty-one".