11001221121 has 8 divisors (see below), whose sum is σ = 16001776224. Its totient is φ = 6667406720.

The previous prime is 11001221117. The next prime is 11001221129. The reversal of 11001221121 is 12112210011.

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 11001221121 - 2² = 11001221117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11001221097 and 11001221106.

It is not an unprimeable number, because it can be changed into a prime (11001221129) 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, 166685136 + ... + 166685201.

It is an arithmetic number, because the mean of its divisors is an integer number (2000222028).

Almost surely, 2^11001221121 is an apocalyptic number.

11001221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001221121 is a deficient number, since it is larger than the sum of its proper divisors (5000555103).

11001221121 is a wasteful number, since it uses less digits than its factorization.

11001221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333370351.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11001221121 its reverse (12112210011), we get a palindrome (23113431132).

It can be divided in two parts, 1100 and 1221121, that added together give a palindrome (1222221).

The spelling of 11001221121 in words is "eleven billion, one million, two hundred twenty-one thousand, one hundred twenty-one".