11233212121 has 4 divisors (see below), whose sum is σ = 11721612672. Its totient is φ = 10744811572.

The previous prime is 11233212101. The next prime is 11233212149. The reversal of 11233212121 is 12121233211.

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 11233212121 - 2²¹ = 11231114969 is a prime.

It is a super-3 number, since 3×11233212121³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11233212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244200241 + ... + 244200286.

It is an arithmetic number, because the mean of its divisors is an integer number (2930403168).

Almost surely, 2^11233212121 is an apocalyptic number.

It is an amenable number.

11233212121 is a deficient number, since it is larger than the sum of its proper divisors (488400551).

11233212121 is an equidigital number, since it uses as much as digits as its factorization.

11233212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488400550.

The product of its digits is 144, while the sum is 19.

Adding to 11233212121 its reverse (12121233211), we get a palindrome (23354445332).

The spelling of 11233212121 in words is "eleven billion, two hundred thirty-three million, two hundred twelve thousand, one hundred twenty-one".