11001222121 has 8 divisors (see below), whose sum is σ = 11649501864. Its totient is φ = 10353070080.

The previous prime is 11001222107. The next prime is 11001222163. The reversal of 11001222121 is 12122210011.

It can be written as a sum of positive squares in 4 ways, for example, as 280897600 + 10720324521 = 16760^2 + 103539^2 .

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 11001222121 - 2⁷ = 11001221993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11001222101) 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, 189301 + ... + 240493.

It is an arithmetic number, because the mean of its divisors is an integer number (1456187733).

Almost surely, 2^11001222121 is an apocalyptic number.

It is an amenable number.

11001222121 is a deficient number, since it is larger than the sum of its proper divisors (648279743).

11001222121 is a wasteful number, since it uses less digits than its factorization.

11001222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63851.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11001222121 its reverse (12122210011), we get a palindrome (23123432132).

It can be divided in two parts, 1100 and 1222121, that added together give a palindrome (1223221).

The spelling of 11001222121 in words is "eleven billion, one million, two hundred twenty-two thousand, one hundred twenty-one".