721363434304340 has 48 divisors (see below), whose sum is σ = 1518564677640192. Its totient is φ = 287840510793216.

The previous prime is 721363434304309. The next prime is 721363434304369. The reversal of 721363434304340 is 43403434363127.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59274557 + ... + 70400283.

It is an arithmetic number, because the mean of its divisors is an integer number (31636764117504).

Almost surely, 2^{721363434304340} is an apocalyptic number.

It is an amenable number.

721363434304340 is an abundant number, since it is smaller than the sum of its proper divisors (797201243335852).

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

721363434304340 is a wasteful number, since it uses less digits than its factorization.

721363434304340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11133656 (or 11133654 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 47.

Adding to 721363434304340 its reverse (43403434363127), we get a palindrome (764766868667467).

The spelling of 721363434304340 in words is "seven hundred twenty-one trillion, three hundred sixty-three billion, four hundred thirty-four million, three hundred four thousand, three hundred forty".