20322231521 has 4 divisors (see below), whose sum is σ = 20446907952. Its totient is φ = 20197555092.

The previous prime is 20322231499. The next prime is 20322231569. The reversal of 20322231521 is 12513222302.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20322231521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20322231581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62337971 + ... + 62338296.

It is an arithmetic number, because the mean of its divisors is an integer number (5111726988).

Almost surely, 2^20322231521 is an apocalyptic number.

It is an amenable number.

20322231521 is a deficient number, since it is larger than the sum of its proper divisors (124676431).

20322231521 is a wasteful number, since it uses less digits than its factorization.

20322231521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124676430.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20322231521 its reverse (12513222302), we get a palindrome (32835453823).

The spelling of 20322231521 in words is "twenty billion, three hundred twenty-two million, two hundred thirty-one thousand, five hundred twenty-one".