21323233123121 has 4 divisors (see below), whose sum is σ = 21530254804032. Its totient is φ = 21116211442212.

The previous prime is 21323233123109. The next prime is 21323233123139. The reversal of 21323233123121 is 12132133232312.

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 a de Polignac number, because none of the positive numbers 2^k-21323233123121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323233120121) 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, 103510840301 + ... + 103510840506.

It is an arithmetic number, because the mean of its divisors is an integer number (5382563701008).

Almost surely, 2^{21323233123121} is an apocalyptic number.

It is an amenable number.

21323233123121 is a deficient number, since it is larger than the sum of its proper divisors (207021680911).

21323233123121 is a wasteful number, since it uses less digits than its factorization.

21323233123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207021680910.

The product of its digits is 7776, while the sum is 29.

Adding to 21323233123121 its reverse (12132133232312), we get a palindrome (33455366355433).

The spelling of 21323233123121 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred thirty-three million, one hundred twenty-three thousand, one hundred twenty-one".