20321101301221 has 4 divisors (see below), whose sum is σ = 23224115772832. Its totient is φ = 17418086829612.

The previous prime is 20321101301143. The next prime is 20321101301311. The reversal of 20321101301221 is 12210310112302.

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 de Polignac number, because none of the positive numbers 2^k-20321101301221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321101301021) 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, 1451507235795 + ... + 1451507235808.

It is an arithmetic number, because the mean of its divisors is an integer number (5806028943208).

Almost surely, 2^{20321101301221} is an apocalyptic number.

It is an amenable number.

20321101301221 is a deficient number, since it is larger than the sum of its proper divisors (2903014471611).

20321101301221 is an equidigital number, since it uses as much as digits as its factorization.

20321101301221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903014471610.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20321101301221 its reverse (12210310112302), we get a palindrome (32531411413523).

The spelling of 20321101301221 in words is "twenty trillion, three hundred twenty-one billion, one hundred one million, three hundred one thousand, two hundred twenty-one".