11220844021 has 4 divisors (see below), whose sum is σ = 11231111212. Its totient is φ = 11210576832.

The previous prime is 11220844013. The next prime is 11220844093. The reversal of 11220844021 is 12044802211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6138722500 + 5082121521 = 78350^2 + 71289^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220844021 - 2³ = 11220844013 is a prime.

It is a super-2 number, since 2×11220844021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220844121) 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, 5131956 + ... + 5134141.

It is an arithmetic number, because the mean of its divisors is an integer number (2807777803).

Almost surely, 2^11220844021 is an apocalyptic number.

It is an amenable number.

11220844021 is a deficient number, since it is larger than the sum of its proper divisors (10267191).

11220844021 is a wasteful number, since it uses less digits than its factorization.

11220844021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10267190.

The product of its (nonzero) digits is 1024, while the sum is 25.

The spelling of 11220844021 in words is "eleven billion, two hundred twenty million, eight hundred forty-four thousand, twenty-one".