321221300021 has 4 divisors (see below), whose sum is σ = 321222477312. Its totient is φ = 321220122732.

The previous prime is 321221300003. The next prime is 321221300033. The reversal of 321221300021 is 120003122123.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 321221300021 - 2¹⁴ = 321221283637 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 (321221302021) 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, 55820 + ... + 803466.

It is an arithmetic number, because the mean of its divisors is an integer number (80305619328).

Almost surely, 2^321221300021 is an apocalyptic number.

It is an amenable number.

321221300021 is a deficient number, since it is larger than the sum of its proper divisors (1177291).

321221300021 is an equidigital number, since it uses as much as digits as its factorization.

321221300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177290.

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

Adding to 321221300021 its reverse (120003122123), we get a palindrome (441224422144).

The spelling of 321221300021 in words is "three hundred twenty-one billion, two hundred twenty-one million, three hundred thousand, twenty-one".