11001022121 has 4 divisors (see below), whose sum is σ = 11018185044. Its totient is φ = 10983859200.

The previous prime is 11001022069. The next prime is 11001022127. The reversal of 11001022121 is 12122010011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10618272025 + 382750096 = 103045^2 + 19564^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001022121 - 2²⁶ = 10933913257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11001022127) 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, 8580500 + ... + 8581781.

It is an arithmetic number, because the mean of its divisors is an integer number (2754546261).

Almost surely, 2^11001022121 is an apocalyptic number.

It is an amenable number.

11001022121 is a deficient number, since it is larger than the sum of its proper divisors (17162923).

11001022121 is an equidigital number, since it uses as much as digits as its factorization.

11001022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17162922.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11001022121 its reverse (12122010011), we get a palindrome (23123032132).

The spelling of 11001022121 in words is "eleven billion, one million, twenty-two thousand, one hundred twenty-one".