321121420021 has 4 divisors (see below), whose sum is σ = 321549012544. Its totient is φ = 320693827500.

The previous prime is 321121420003. The next prime is 321121420031. The reversal of 321121420021 is 120024121123.

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 not a de Polignac number, because 321121420021 - 2¹³ = 321121411829 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 (321121420031) 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, 213795135 + ... + 213796636.

It is an arithmetic number, because the mean of its divisors is an integer number (80387253136).

Almost surely, 2^321121420021 is an apocalyptic number.

It is an amenable number.

321121420021 is a deficient number, since it is larger than the sum of its proper divisors (427592523).

321121420021 is an equidigital number, since it uses as much as digits as its factorization.

321121420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427592522.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 321121420021 its reverse (120024121123), we get a palindrome (441145541144).

The spelling of 321121420021 in words is "three hundred twenty-one billion, one hundred twenty-one million, four hundred twenty thousand, twenty-one".