11011111100021 has 4 divisors (see below), whose sum is σ = 11590643263200. Its totient is φ = 10431578936844.

The previous prime is 11011111099981. The next prime is 11011111100023. The reversal of 11011111100021 is 12000111111011.

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 11011111100021 - 2¹⁰ = 11011111098997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011111099975 and 11011111100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011111100023) 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, 289766081561 + ... + 289766081598.

It is an arithmetic number, because the mean of its divisors is an integer number (2897660815800).

Almost surely, 2^{11011111100021} is an apocalyptic number.

It is an amenable number.

11011111100021 is a deficient number, since it is larger than the sum of its proper divisors (579532163179).

11011111100021 is an equidigital number, since it uses as much as digits as its factorization.

11011111100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579532163178.

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

Adding to 11011111100021 its reverse (12000111111011), we get a palindrome (23011222211032).

The spelling of 11011111100021 in words is "eleven trillion, eleven billion, one hundred eleven million, one hundred thousand, twenty-one".