11221020021 has 4 divisors (see below), whose sum is σ = 14961360032. Its totient is φ = 7480680012.

The previous prime is 11221020011. The next prime is 11221020137. The reversal of 11221020021 is 12002012211.

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 11221020021 - 2¹⁴ = 11221003637 is a prime.

It is a super-2 number, since 2×11221020021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221019979 and 11221020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221020011) 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, 1870170001 + ... + 1870170006.

It is an arithmetic number, because the mean of its divisors is an integer number (3740340008).

Almost surely, 2^11221020021 is an apocalyptic number.

It is an amenable number.

11221020021 is a deficient number, since it is larger than the sum of its proper divisors (3740340011).

11221020021 is an equidigital number, since it uses as much as digits as its factorization.

11221020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740340010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 11221020021 its reverse (12002012211), we get a palindrome (23223032232).

It can be divided in two parts, 112210 and 20021, that added together give a palindrome (132231).

The spelling of 11221020021 in words is "eleven billion, two hundred twenty-one million, twenty thousand, twenty-one".