321400221 has 4 divisors (see below), whose sum is σ = 428533632. Its totient is φ = 214266812.

The previous prime is 321400193. The next prime is 321400267. The reversal of 321400221 is 122004123.

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 321400221 - 2¹⁷ = 321269149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321400221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321400021) 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, 53566701 + ... + 53566706.

It is an arithmetic number, because the mean of its divisors is an integer number (107133408).

Almost surely, 2^321400221 is an apocalyptic number.

It is an amenable number.

321400221 is a deficient number, since it is larger than the sum of its proper divisors (107133411).

321400221 is a wasteful number, since it uses less digits than its factorization.

321400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107133410.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 321400221 is about 17927.6384669036. The cubic root of 321400221 is about 684.9865705006.

Adding to 321400221 its reverse (122004123), we get a palindrome (443404344).

The spelling of 321400221 in words is "three hundred twenty-one million, four hundred thousand, two hundred twenty-one".