11011101021221 has 4 divisors (see below), whose sum is σ = 12584115452832. Its totient is φ = 9438086589612.

The previous prime is 11011101021211. The next prime is 11011101021223. The reversal of 11011101021221 is 12212010111011.

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 11011101021221 - 2¹⁴ = 11011101004837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11011101021196 and 11011101021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011101021223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786507215795 + ... + 786507215808.

It is an arithmetic number, because the mean of its divisors is an integer number (3146028863208).

Almost surely, 2^{11011101021221} is an apocalyptic number.

It is an amenable number.

11011101021221 is a deficient number, since it is larger than the sum of its proper divisors (1573014431611).

11011101021221 is an equidigital number, since it uses as much as digits as its factorization.

11011101021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573014431610.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 11011101021221 its reverse (12212010111011), we get a palindrome (23223111132232).

The spelling of 11011101021221 in words is "eleven trillion, eleven billion, one hundred one million, twenty-one thousand, two hundred twenty-one".