11010211221 has 4 divisors (see below), whose sum is σ = 14680281632. Its totient is φ = 7340140812.

The previous prime is 11010211153. The next prime is 11010211229. The reversal of 11010211221 is 12211201011.

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 not a de Polignac number, because 11010211221 - 2¹⁷ = 11010080149 is a prime.

It is a super-2 number, since 2×11010211221² (a number of 21 digits) contains 22 as substring.

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 = 11010211197 and 11010211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11010211229) 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, 1835035201 + ... + 1835035206.

It is an arithmetic number, because the mean of its divisors is an integer number (3670070408).

Almost surely, 2^11010211221 is an apocalyptic number.

It is an amenable number.

11010211221 is a deficient number, since it is larger than the sum of its proper divisors (3670070411).

11010211221 is an equidigital number, since it uses as much as digits as its factorization.

11010211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670070410.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11010211221 its reverse (12211201011), we get a palindrome (23221412232).

The spelling of 11010211221 in words is "eleven billion, ten million, two hundred eleven thousand, two hundred twenty-one".