20331312121 has 8 divisors (see below), whose sum is σ = 21414330080. Its totient is φ = 19249589088.

The previous prime is 20331312119. The next prime is 20331312167. The reversal of 20331312121 is 12121313302.

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 20331312121 - 2¹ = 20331312119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20331312181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291411 + ... + 354376.

It is an arithmetic number, because the mean of its divisors is an integer number (2676791260).

Almost surely, 2^20331312121 is an apocalyptic number.

It is an amenable number.

20331312121 is a deficient number, since it is larger than the sum of its proper divisors (1083017959).

20331312121 is a wasteful number, since it uses less digits than its factorization.

20331312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647463.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20331312121 its reverse (12121313302), we get a palindrome (32452625423).

The spelling of 20331312121 in words is "twenty billion, three hundred thirty-one million, three hundred twelve thousand, one hundred twenty-one".