321421145 has 4 divisors (see below), whose sum is σ = 385705380. Its totient is φ = 257136912.

The previous prime is 321421141. The next prime is 321421201. The reversal of 321421145 is 541124123.

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 185068816 + 136352329 = 13604^2 + 11677^2 .

It is a cyclic number.

It is not a de Polignac number, because 321421145 - 2² = 321421141 is a prime.

It is a super-2 number, since 2×321421145² = 206623104906222050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 321421145.

It is not an unprimeable number, because it can be changed into a prime (321421141) 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, 32142110 + ... + 32142119.

It is an arithmetic number, because the mean of its divisors is an integer number (96426345).

Almost surely, 2^321421145 is an apocalyptic number.

It is an amenable number.

321421145 is a deficient number, since it is larger than the sum of its proper divisors (64284235).

321421145 is an equidigital number, since it uses as much as digits as its factorization.

321421145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64284234.

The product of its digits is 960, while the sum is 23.

The square root of 321421145 is about 17928.2220256221. Note that the first 3 decimals coincide. The cubic root of 321421145 is about 685.0014349873.

Adding to 321421145 its reverse (541124123), we get a palindrome (862545268).

The spelling of 321421145 in words is "three hundred twenty-one million, four hundred twenty-one thousand, one hundred forty-five".