20312023121 has 8 divisors (see below), whose sum is σ = 22068067560. Its totient is φ = 18583633152.

The previous prime is 20312023117. The next prime is 20312023129. The reversal of 20312023121 is 12132021302.

It can be written as a sum of positive squares in 4 ways, for example, as 384748225 + 19927274896 = 19615^2 + 141164^2 .

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 20312023121 - 2² = 20312023117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20312023121.

It is not an unprimeable number, because it can be changed into a prime (20312023129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6912086 + ... + 6915023.

It is an arithmetic number, because the mean of its divisors is an integer number (2758508445).

Almost surely, 2^20312023121 is an apocalyptic number.

It is an amenable number.

20312023121 is a deficient number, since it is larger than the sum of its proper divisors (1756044439).

20312023121 is a wasteful number, since it uses less digits than its factorization.

20312023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13827235.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20312023121 its reverse (12132021302), we get a palindrome (32444044423).

The spelling of 20312023121 in words is "twenty billion, three hundred twelve million, twenty-three thousand, one hundred twenty-one".