11331121021 has 8 divisors (see below), whose sum is σ = 12362148288. Its totient is φ = 10300248000.

The previous prime is 11331121001. The next prime is 11331121033. The reversal of 11331121021 is 12012113311.

It is a happy number.

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 11331121021 - 2⁹ = 11331120509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11331120986 and 11331121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11331121001) 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, 159141 + ... + 219061.

It is an arithmetic number, because the mean of its divisors is an integer number (1545268536).

Almost surely, 2^11331121021 is an apocalyptic number.

11331121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11331121021 is a deficient number, since it is larger than the sum of its proper divisors (1031027267).

11331121021 is a wasteful number, since it uses less digits than its factorization.

11331121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77123.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11331121021 its reverse (12012113311), we get a palindrome (23343234332).

The spelling of 11331121021 in words is "eleven billion, three hundred thirty-one million, one hundred twenty-one thousand, twenty-one".