321927421 has 2 divisors, whose sum is σ = 321927422. Its totient is φ = 321927420.

The previous prime is 321927413. The next prime is 321927433. The reversal of 321927421 is 124729123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315240025 + 6687396 = 17755^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 321927421 - 2³ = 321927413 is a prime.

It is a super-2 number, since 2×321927421² = 207274528783422482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321927451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160963710 + 160963711.

It is an arithmetic number, because the mean of its divisors is an integer number (160963711).

Almost surely, 2^321927421 is an apocalyptic number.

It is an amenable number.

321927421 is a deficient number, since it is larger than the sum of its proper divisors (1).

321927421 is an equidigital number, since it uses as much as digits as its factorization.

321927421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 321927421 is about 17942.3359961851. The cubic root of 321927421 is about 685.3608988534.

The spelling of 321927421 in words is "three hundred twenty-one million, nine hundred twenty-seven thousand, four hundred twenty-one".