20321201323123 has 4 divisors (see below), whose sum is σ = 20566035074088. Its totient is φ = 20076367572160.

The previous prime is 20321201323109. The next prime is 20321201323147. The reversal of 20321201323123 is 32132310212302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321201323123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321201323823) 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, 122416875358 + ... + 122416875523.

It is an arithmetic number, because the mean of its divisors is an integer number (5141508768522).

Almost surely, 2^{20321201323123} is an apocalyptic number.

20321201323123 is a deficient number, since it is larger than the sum of its proper divisors (244833750965).

20321201323123 is an equidigital number, since it uses as much as digits as its factorization.

20321201323123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244833750964.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 20321201323123 its reverse (32132310212302), we get a palindrome (52453511535425).

The spelling of 20321201323123 in words is "twenty trillion, three hundred twenty-one billion, two hundred one million, three hundred twenty-three thousand, one hundred twenty-three".