21231330312121 has 8 divisors (see below), whose sum is σ = 22228064974080. Its totient is φ = 20252236971792.

The previous prime is 21231330312119. The next prime is 21231330312133. The reversal of 21231330312121 is 12121303313212.

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 21231330312121 - 2¹ = 21231330312119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231330312421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4410327945 + ... + 4410332758.

It is an arithmetic number, because the mean of its divisors is an integer number (2778508121760).

Almost surely, 2^{21231330312121} is an apocalyptic number.

It is an amenable number.

21231330312121 is a deficient number, since it is larger than the sum of its proper divisors (996734661959).

21231330312121 is an equidigital number, since it uses as much as digits as its factorization.

21231330312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8820660815.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21231330312121 its reverse (12121303313212), we get a palindrome (33352633625333).

The spelling of 21231330312121 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred thirty million, three hundred twelve thousand, one hundred twenty-one".