20115132321 has 4 divisors (see below), whose sum is σ = 26820176432. Its totient is φ = 13410088212.

The previous prime is 20115132319. The next prime is 20115132361. The reversal of 20115132321 is 12323151102.

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 not a de Polignac number, because 20115132321 - 2¹ = 20115132319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20115132311) 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 3 ways as a sum of consecutive naturals, for example, 3352522051 + ... + 3352522056.

It is an arithmetic number, because the mean of its divisors is an integer number (6705044108).

Almost surely, 2^20115132321 is an apocalyptic number.

It is an amenable number.

20115132321 is a deficient number, since it is larger than the sum of its proper divisors (6705044111).

20115132321 is an equidigital number, since it uses as much as digits as its factorization.

20115132321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6705044110.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 20115132321 its reverse (12323151102), we get a palindrome (32438283423).

The spelling of 20115132321 in words is "twenty billion, one hundred fifteen million, one hundred thirty-two thousand, three hundred twenty-one".