21233130121121 has 4 divisors (see below), whose sum is σ = 21726923844912. Its totient is φ = 20739336397332.

The previous prime is 21233130121117. The next prime is 21233130121157. The reversal of 21233130121121 is 12112103133212.

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 21233130121121 - 2² = 21233130121117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233130121171) 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, 246896861831 + ... + 246896861916.

It is an arithmetic number, because the mean of its divisors is an integer number (5431730961228).

Almost surely, 2^{21233130121121} is an apocalyptic number.

It is an amenable number.

21233130121121 is a deficient number, since it is larger than the sum of its proper divisors (493793723791).

21233130121121 is an equidigital number, since it uses as much as digits as its factorization.

21233130121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493793723790.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21233130121121 its reverse (12112103133212), we get a palindrome (33345233254333).

The spelling of 21233130121121 in words is "twenty-one trillion, two hundred thirty-three billion, one hundred thirty million, one hundred twenty-one thousand, one hundred twenty-one".