220321351640 has 64 divisors (see below), whose sum is σ = 534035194560. Its totient is φ = 81322053120.

The previous prime is 220321351583. The next prime is 220321351751. The reversal of 220321351640 is 46153123022.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1509485 + ... + 1648995.

It is an arithmetic number, because the mean of its divisors is an integer number (8344299915).

Almost surely, 2^220321351640 is an apocalyptic number.

220321351640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220321351640 is an abundant number, since it is smaller than the sum of its proper divisors (313713842920).

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

220321351640 is a wasteful number, since it uses less digits than its factorization.

220321351640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142572 (or 142568 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 220321351640 its reverse (46153123022), we get a palindrome (266474474662).

The spelling of 220321351640 in words is "two hundred twenty billion, three hundred twenty-one million, three hundred fifty-one thousand, six hundred forty".