321214021 has 4 divisors (see below), whose sum is σ = 335179872. Its totient is φ = 307248172.

The previous prime is 321214009. The next prime is 321214093. The reversal of 321214021 is 120412123.

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 321214021 - 2⁵ = 321213989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321213986 and 321214004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321214001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6982891 + ... + 6982936.

It is an arithmetic number, because the mean of its divisors is an integer number (83794968).

Almost surely, 2^321214021 is an apocalyptic number.

It is an amenable number.

321214021 is a deficient number, since it is larger than the sum of its proper divisors (13965851).

321214021 is a wasteful number, since it uses less digits than its factorization.

321214021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13965850.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 321214021 is about 17922.4446156209. Note that the first 3 decimals coincide. The cubic root of 321214021 is about 684.8542649102.

Adding to 321214021 its reverse (120412123), we get a palindrome (441626144).

The spelling of 321214021 in words is "three hundred twenty-one million, two hundred fourteen thousand, twenty-one".