20321121153 has 4 divisors (see below), whose sum is σ = 27094828208. Its totient is φ = 13547414100.

The previous prime is 20321121151. The next prime is 20321121157. The reversal of 20321121153 is 35112112302.

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 20321121153 - 2¹ = 20321121151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321121151) 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, 3386853523 + ... + 3386853528.

It is an arithmetic number, because the mean of its divisors is an integer number (6773707052).

Almost surely, 2^20321121153 is an apocalyptic number.

It is an amenable number.

20321121153 is a deficient number, since it is larger than the sum of its proper divisors (6773707055).

20321121153 is an equidigital number, since it uses as much as digits as its factorization.

20321121153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773707054.

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

Adding to 20321121153 its reverse (35112112302), we get a palindrome (55433233455).

The spelling of 20321121153 in words is "twenty billion, three hundred twenty-one million, one hundred twenty-one thousand, one hundred fifty-three".