11021222221 has 8 divisors (see below), whose sum is σ = 11038325760. Its totient is φ = 11004133728.

The previous prime is 11021222209. The next prime is 11021222237. The reversal of 11021222221 is 12222212011.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11021222221 - 2⁵ = 11021222189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11021222195 and 11021222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021222521) 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, 2945770 + ... + 2949508.

It is an arithmetic number, because the mean of its divisors is an integer number (1379790720).

Almost surely, 2^11021222221 is an apocalyptic number.

It is an amenable number.

11021222221 is a deficient number, since it is larger than the sum of its proper divisors (17103539).

11021222221 is a wasteful number, since it uses less digits than its factorization.

11021222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7523.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11021222221 its reverse (12222212011), we get a palindrome (23243434232).

The spelling of 11021222221 in words is "eleven billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".