321240424220 has 24 divisors (see below), whose sum is σ = 690293378544. Its totient is φ = 125507886336.

The previous prime is 321240424189. The next prime is 321240424223. The reversal of 321240424220 is 22424042123.

It is a self number, because there is not a number n which added to its sum of digits gives 321240424220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321240424223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186766829 + ... + 186768548.

It is an arithmetic number, because the mean of its divisors is an integer number (28762224106).

Almost surely, 2^321240424220 is an apocalyptic number.

It is an amenable number.

321240424220 is an abundant number, since it is smaller than the sum of its proper divisors (369052954324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321240424220 is a wasteful number, since it uses less digits than its factorization.

321240424220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373535429 (or 373535427 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 321240424220 its reverse (22424042123), we get a palindrome (343664466343).

The spelling of 321240424220 in words is "three hundred twenty-one billion, two hundred forty million, four hundred twenty-four thousand, two hundred twenty".