20321012221320 has 128 divisors (see below), whose sum is σ = 61446893207040. Its totient is φ = 5375977205760.

The previous prime is 20321012221219. The next prime is 20321012221373. The reversal of 20321012221320 is 2312221012302.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25634100 + ... + 26414940.

It is an arithmetic number, because the mean of its divisors is an integer number (480053853180).

Almost surely, 2^{20321012221320} is an apocalyptic number.

20321012221320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20321012221320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30723446603520).

20321012221320 is an abundant number, since it is smaller than the sum of its proper divisors (41125880985720).

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

20321012221320 is a wasteful number, since it uses less digits than its factorization.

20321012221320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782575 (or 782571 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20321012221320 its reverse (2312221012302), we get a palindrome (22633233233622).

The spelling of 20321012221320 in words is "twenty trillion, three hundred twenty-one billion, twelve million, two hundred twenty-one thousand, three hundred twenty".