11010011221 has 4 divisors (see below), whose sum is σ = 12010921344. Its totient is φ = 10009101100.

The previous prime is 11010011209. The next prime is 11010011261. The reversal of 11010011221 is 12211001011.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12211001011 = 11 ⋅1110091001.

It is a cyclic number.

It is not a de Polignac number, because 11010011221 - 2¹⁵ = 11009978453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11010011198 and 11010011207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11010011261) 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, 500455045 + ... + 500455066.

It is an arithmetic number, because the mean of its divisors is an integer number (3002730336).

Almost surely, 2^11010011221 is an apocalyptic number.

11010011221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11010011221 is a deficient number, since it is larger than the sum of its proper divisors (1000910123).

11010011221 is a wasteful number, since it uses less digits than its factorization.

11010011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000910122.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 11010011221 its reverse (12211001011), we get a palindrome (23221012232).

The spelling of 11010011221 in words is "eleven billion, ten million, eleven thousand, two hundred twenty-one".