21233132121 has 8 divisors (see below), whose sum is σ = 28459067904. Its totient is φ = 14081308880.

The previous prime is 21233132071. The next prime is 21233132161. The reversal of 21233132121 is 12123133212.

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 21233132121 - 2⁶ = 21233132057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21233132161) 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 7 ways as a sum of consecutive naturals, for example, 18527466 + ... + 18528611.

It is an arithmetic number, because the mean of its divisors is an integer number (3557383488).

Almost surely, 2^21233132121 is an apocalyptic number.

It is an amenable number.

21233132121 is a deficient number, since it is larger than the sum of its proper divisors (7225935783).

21233132121 is a wasteful number, since it uses less digits than its factorization.

21233132121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37056271.

The product of its digits is 432, while the sum is 21.

Adding to 21233132121 its reverse (12123133212), we get a palindrome (33356265333).

The spelling of 21233132121 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirty-two thousand, one hundred twenty-one".