721013312112 has 80 divisors (see below), whose sum is σ = 1894561240320. Its totient is φ = 236236492800.

The previous prime is 721013312111. The next prime is 721013312191. The reversal of 721013312112 is 211213310127.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721013312111) 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 15 ways as a sum of consecutive naturals, for example, 808464 + ... + 1447632.

It is an arithmetic number, because the mean of its divisors is an integer number (23682015504).

Almost surely, 2^721013312112 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 721013312112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947280620160).

721013312112 is an abundant number, since it is smaller than the sum of its proper divisors (1173547928208).

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

721013312112 is a wasteful number, since it uses less digits than its factorization.

721013312112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639582 (or 639576 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

Adding to 721013312112 its reverse (211213310127), we get a palindrome (932226622239).

The spelling of 721013312112 in words is "seven hundred twenty-one billion, thirteen million, three hundred twelve thousand, one hundred twelve".