321561321 has 8 divisors (see below), whose sum is σ = 447389760. Its totient is φ = 205053552.

The previous prime is 321561299. The next prime is 321561337. The reversal of 321561321 is 123165123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 321561321 - 2¹³ = 321553129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321561291 and 321561300.

It is not an unprimeable number, because it can be changed into a prime (321562321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2330086 + ... + 2330223.

It is an arithmetic number, because the mean of its divisors is an integer number (55923720).

Almost surely, 2^321561321 is an apocalyptic number.

It is an amenable number.

321561321 is a deficient number, since it is larger than the sum of its proper divisors (125828439).

321561321 is a wasteful number, since it uses less digits than its factorization.

321561321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660335.

The product of its digits is 1080, while the sum is 24.

The square root of 321561321 is about 17932.1309665081. The cubic root of 321561321 is about 685.1009999012.

The spelling of 321561321 in words is "three hundred twenty-one million, five hundred sixty-one thousand, three hundred twenty-one".