321220131 has 8 divisors (see below), whose sum is σ = 435552960. Its totient is φ = 210517032.

The previous prime is 321220103. The next prime is 321220147. The reversal of 321220131 is 131022123.

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

It is not a de Polignac number, because 321220131 - 2¹³ = 321211939 is a prime.

It is a super-2 number, since 2×321220131² = 206364745119314322, 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 321220131.

It is not an unprimeable number, because it can be changed into a prime (321220931) 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, 907225 + ... + 907578.

It is an arithmetic number, because the mean of its divisors is an integer number (54444120).

Almost surely, 2^321220131 is an apocalyptic number.

321220131 is a deficient number, since it is larger than the sum of its proper divisors (114332829).

321220131 is a wasteful number, since it uses less digits than its factorization.

321220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814865.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 321220131 is about 17922.6150714677. The cubic root of 321220131 is about 684.8586072207.

Adding to 321220131 its reverse (131022123), we get a palindrome (452242254).

The spelling of 321220131 in words is "three hundred twenty-one million, two hundred twenty thousand, one hundred thirty-one".