11023231121221 has 4 divisors (see below), whose sum is σ = 12025343041344. Its totient is φ = 10021119201100.

The previous prime is 11023231121131. The next prime is 11023231121233. The reversal of 11023231121221 is 12212113232011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11023231121221 - 2²⁵ = 11023197566789 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11023231121192 and 11023231121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11023231121251) 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, 501055960045 + ... + 501055960066.

It is an arithmetic number, because the mean of its divisors is an integer number (3006335760336).

Almost surely, 2^{11023231121221} is an apocalyptic number.

11023231121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11023231121221 is a deficient number, since it is larger than the sum of its proper divisors (1002111920123).

11023231121221 is a wasteful number, since it uses less digits than its factorization.

11023231121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002111920122.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 11023231121221 its reverse (12212113232011), we get a palindrome (23235344353232).

The spelling of 11023231121221 in words is "eleven trillion, twenty-three billion, two hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty-one".