20421031323312 has 160 divisors (see below), whose sum is σ = 58750971840000. Its totient is φ = 6791336582400.

The previous prime is 20421031323221. The next prime is 20421031323359. The reversal of 20421031323312 is 21332313012402.

20421031323312 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 10 + 313 + 2 + 331 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 725396437 + ... + 725424587.

It is an arithmetic number, because the mean of its divisors is an integer number (367193574000).

Almost surely, 2^{20421031323312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20421031323312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29375485920000).

20421031323312 is an abundant number, since it is smaller than the sum of its proper divisors (38329940516688).

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

20421031323312 is a wasteful number, since it uses less digits than its factorization.

20421031323312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31976 (or 31964 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 20421031323312 its reverse (21332313012402), we get a palindrome (41753344335714).

The spelling of 20421031323312 in words is "twenty trillion, four hundred twenty-one billion, thirty-one million, three hundred twenty-three thousand, three hundred twelve".