320135421220 has 24 divisors (see below), whose sum is σ = 672479451000. Its totient is φ = 128017012992.

The previous prime is 320135421191. The next prime is 320135421241. The reversal of 320135421220 is 22124531023.

It can be written as a sum of positive squares in 4 ways, for example, as 3420846144 + 316714575076 = 58488^2 + 562774^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2251515 + ... + 2389474.

It is an arithmetic number, because the mean of its divisors is an integer number (28019977125).

Almost surely, 2^320135421220 is an apocalyptic number.

It is an amenable number.

320135421220 is an abundant number, since it is smaller than the sum of its proper divisors (352344029780).

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

320135421220 is a wasteful number, since it uses less digits than its factorization.

320135421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4644447 (or 4644445 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 320135421220 its reverse (22124531023), we get a palindrome (342259952243).

The spelling of 320135421220 in words is "three hundred twenty billion, one hundred thirty-five million, four hundred twenty-one thousand, two hundred twenty".