11021210221 has 4 divisors (see below), whose sum is σ = 12595668832. Its totient is φ = 9446751612.

The previous prime is 11021210209. The next prime is 11021210227. The reversal of 11021210221 is 12201212011.

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: 12201212011 = 7487 ⋅1629653.

It is a cyclic number.

It is not a de Polignac number, because 11021210221 - 2¹³ = 11021202029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021210227) 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, 787229295 + ... + 787229308.

It is an arithmetic number, because the mean of its divisors is an integer number (3148917208).

Almost surely, 2^11021210221 is an apocalyptic number.

It is an amenable number.

11021210221 is a deficient number, since it is larger than the sum of its proper divisors (1574458611).

11021210221 is an equidigital number, since it uses as much as digits as its factorization.

11021210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574458610.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11021210221 its reverse (12201212011), we get a palindrome (23222422232).

The spelling of 11021210221 in words is "eleven billion, twenty-one million, two hundred ten thousand, two hundred twenty-one".