321420445 has 16 divisors (see below), whose sum is σ = 409876848. Its totient is φ = 241131520.

The previous prime is 321420413. The next prime is 321420457. The reversal of 321420445 is 544024123.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 88003161 + 233417284 = 9381^2 + 15278^2 .

It is not a de Polignac number, because 321420445 - 2⁵ = 321420413 is a prime.

It is a super-2 number, since 2×321420445² = 206622204927996050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17157 + ... + 30613.

It is an arithmetic number, because the mean of its divisors is an integer number (25617303).

Almost surely, 2^321420445 is an apocalyptic number.

It is an amenable number.

321420445 is a deficient number, since it is larger than the sum of its proper divisors (88456403).

321420445 is a wasteful number, since it uses less digits than its factorization.

321420445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13760.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 321420445 is about 17928.2025033186. The cubic root of 321420445 is about 685.0009377152. Note that the first 3 decimals are identical.

Adding to 321420445 its reverse (544024123), we get a palindrome (865444568).

The spelling of 321420445 in words is "three hundred twenty-one million, four hundred twenty thousand, four hundred forty-five".