11001222221 has 8 divisors (see below), whose sum is σ = 12009010944. Its totient is φ = 9994713120.

The previous prime is 11001222209. The next prime is 11001222233. The reversal of 11001222221 is 12222210011.

It is an interprime number because it is at equal distance from previous prime (11001222209) and next prime (11001222233).

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 11001222221 - 2¹⁰ = 11001221197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001222196 and 11001222205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001222241) 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, 301880 + ... + 336353.

It is an arithmetic number, because the mean of its divisors is an integer number (1501126368).

Almost surely, 2^11001222221 is an apocalyptic number.

11001222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001222221 is a deficient number, since it is larger than the sum of its proper divisors (1007788723).

11001222221 is a wasteful number, since it uses less digits than its factorization.

11001222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639811.

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

Adding to 11001222221 its reverse (12222210011), we get a palindrome (23223432232).

The spelling of 11001222221 in words is "eleven billion, one million, two hundred twenty-two thousand, two hundred twenty-one".