11100021221 has 8 divisors (see below), whose sum is σ = 11295984600. Its totient is φ = 10904509440.

The previous prime is 11100021203. The next prime is 11100021223. The reversal of 11100021221 is 12212000111.

It can be written as a sum of positive squares in 4 ways, for example, as 1077808900 + 10022212321 = 32830^2 + 100111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11100021221 is a prime.

It is a super-2 number, since 2×11100021221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100021223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63116 + ... + 161813.

It is an arithmetic number, because the mean of its divisors is an integer number (1411998075).

Almost surely, 2^11100021221 is an apocalyptic number.

It is an amenable number.

11100021221 is a deficient number, since it is larger than the sum of its proper divisors (195963379).

11100021221 is an equidigital number, since it uses as much as digits as its factorization.

11100021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225799.

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

Adding to 11100021221 its reverse (12212000111), we get a palindrome (23312021332).

The spelling of 11100021221 in words is "eleven billion, one hundred million, twenty-one thousand, two hundred twenty-one".