11133212021 has 4 divisors (see below), whose sum is σ = 11160976044. Its totient is φ = 11105448000.

The previous prime is 11133212017. The next prime is 11133212023. The reversal of 11133212021 is 12021233111.

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 7900720996 + 3232491025 = 88886^2 + 56855^2 .

It is a cyclic number.

It is not a de Polignac number, because 11133212021 - 2² = 11133212017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11133212023) 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, 13881410 + ... + 13882211.

It is an arithmetic number, because the mean of its divisors is an integer number (2790244011).

Almost surely, 2^11133212021 is an apocalyptic number.

It is an amenable number.

11133212021 is a deficient number, since it is larger than the sum of its proper divisors (27764023).

11133212021 is an equidigital number, since it uses as much as digits as its factorization.

11133212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27764022.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11133212021 its reverse (12021233111), we get a palindrome (23154445132).

The spelling of 11133212021 in words is "eleven billion, one hundred thirty-three million, two hundred twelve thousand, twenty-one".