11221323021 has 12 divisors (see below), whose sum is σ = 16213651740. Its totient is φ = 7478540160.

The previous prime is 11221323019. The next prime is 11221323049. The reversal of 11221323021 is 12032312211.

It can be written as a sum of positive squares in 2 ways, for example, as 9691418025 + 1529904996 = 98445^2 + 39114^2 .

It is not a de Polignac number, because 11221323021 - 2¹ = 11221323019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11221322985 and 11221323003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221324021) 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 11 ways as a sum of consecutive naturals, for example, 164556 + ... + 222533.

It is an arithmetic number, because the mean of its divisors is an integer number (1351137645).

Almost surely, 2^11221323021 is an apocalyptic number.

It is an amenable number.

11221323021 is a deficient number, since it is larger than the sum of its proper divisors (4992328719).

11221323021 is a wasteful number, since it uses less digits than its factorization.

11221323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390316 (or 390313 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 11221323021 its reverse (12032312211), we get a palindrome (23253635232).

The spelling of 11221323021 in words is "eleven billion, two hundred twenty-one million, three hundred twenty-three thousand, twenty-one".