20321201231 has 4 divisors (see below), whose sum is σ = 20396745000. Its totient is φ = 20245657464.

The previous prime is 20321201227. The next prime is 20321201261. The reversal of 20321201231 is 13210212302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20321201231 - 2² = 20321201227 is a prime.

It is a super-2 number, since 2×20321201231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321201221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37771481 + ... + 37772018.

It is an arithmetic number, because the mean of its divisors is an integer number (5099186250).

Almost surely, 2^20321201231 is an apocalyptic number.

20321201231 is a deficient number, since it is larger than the sum of its proper divisors (75543769).

20321201231 is an equidigital number, since it uses as much as digits as its factorization.

20321201231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75543768.

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

Adding to 20321201231 its reverse (13210212302), we get a palindrome (33531413533).

The spelling of 20321201231 in words is "twenty billion, three hundred twenty-one million, two hundred one thousand, two hundred thirty-one".