321421 has 4 divisors (see below), whose sum is σ = 322812. Its totient is φ = 320032.
The previous prime is 321413. The next prime is 321427. The reversal of 321421 is 124123.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 212521 + 108900 = 461^2 + 330^2 .
It is a cyclic number.
It is not a de Polignac number, because 321421 - 23 = 321413 is a prime.
It is a super-2 number, since 2×3214212 = 206622918482, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (321427) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256 + ... + 841.
It is an arithmetic number, because the mean of its divisors is an integer number (80703).
2321421 is an apocalyptic number.
It is an amenable number.
321421 is a deficient number, since it is larger than the sum of its proper divisors (1391).
321421 is a wasteful number, since it uses less digits than its factorization.
321421 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1390.
The product of its digits is 48, while the sum is 13.
The square root of 321421 is about 566.9400321022. The cubic root of 321421 is about 68.5001331981.
Adding to 321421 its reverse (124123), we get a palindrome (445544).
The spelling of 321421 in words is "three hundred twenty-one thousand, four hundred twenty-one", and thus it is an iban number.
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