721343446172 has 12 divisors (see below), whose sum is σ = 1262360724576. Its totient is φ = 360668953440.

The previous prime is 721343446171. The next prime is 721343446189. The reversal of 721343446172 is 271644343127.

It is a super-2 number, since 2×721343446172² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721343446171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37604 + ... + 1201707.

It is an arithmetic number, because the mean of its divisors is an integer number (105196727048).

Almost surely, 2^721343446172 is an apocalyptic number.

It is an amenable number.

721343446172 is a deficient number, since it is larger than the sum of its proper divisors (541017278404).

721343446172 is a wasteful number, since it uses less digits than its factorization.

721343446172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384828 (or 1384826 counting only the distinct ones).

The product of its digits is 677376, while the sum is 44.

Adding to 721343446172 its reverse (271644343127), we get a palindrome (992987789299).

The spelling of 721343446172 in words is "seven hundred twenty-one billion, three hundred forty-three million, four hundred forty-six thousand, one hundred seventy-two".