11220011021 has 4 divisors (see below), whose sum is σ = 11225699772. Its totient is φ = 11214322272.

The previous prime is 11220010993. The next prime is 11220011053. The reversal of 11220011021 is 12011002211.

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 4660792900 + 6559218121 = 68270^2 + 80989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220011021 is a prime.

It is a super-2 number, since 2×11220011021² (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 = 11220010993 and 11220011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220011921) 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, 2841416 + ... + 2845361.

It is an arithmetic number, because the mean of its divisors is an integer number (2806424943).

Almost surely, 2^11220011021 is an apocalyptic number.

It is an amenable number.

11220011021 is a deficient number, since it is larger than the sum of its proper divisors (5688751).

11220011021 is an equidigital number, since it uses as much as digits as its factorization.

11220011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688750.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11220011021 its reverse (12011002211), we get a palindrome (23231013232).

The spelling of 11220011021 in words is "eleven billion, two hundred twenty million, eleven thousand, twenty-one".