11002221221 has 4 divisors (see below), whose sum is σ = 11002692672. Its totient is φ = 11001749772.

The previous prime is 11002221193. The next prime is 11002221229. The reversal of 11002221221 is 12212220011.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11002221221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11002221196 and 11002221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11002221229) 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, 198791 + ... + 248036.

It is an arithmetic number, because the mean of its divisors is an integer number (2750673168).

Almost surely, 2^11002221221 is an apocalyptic number.

It is an amenable number.

11002221221 is a deficient number, since it is larger than the sum of its proper divisors (471451).

11002221221 is an equidigital number, since it uses as much as digits as its factorization.

11002221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471450.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 11002221221 its reverse (12212220011), we get a palindrome (23214441232).

The spelling of 11002221221 in words is "eleven billion, two million, two hundred twenty-one thousand, two hundred twenty-one".