721443122402 has 6 divisors (see below), whose sum is σ = 1082166485409. Its totient is φ = 360720960600.

The previous prime is 721443122383. The next prime is 721443122437. The reversal of 721443122402 is 204221344127.

It can be written as a sum of positive squares in 2 ways, for example, as 576945065761 + 144498056641 = 759569^2 + 380129^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=600601.

It is a super-2 number, since 2×721443122402² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 900902 + ... + 1501502.

Almost surely, 2^721443122402 is an apocalyptic number.

721443122402 is a deficient number, since it is larger than the sum of its proper divisors (360723363007).

721443122402 is an frugal number, since it uses more digits than its factorization.

721443122402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201204 (or 600603 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

Multiplying 721443122402 by its sum of digits (32), we get a square (23086179916864 = 4804808²).

Adding to 721443122402 its reverse (204221344127), we get a palindrome (925664466529).

The spelling of 721443122402 in words is "seven hundred twenty-one billion, four hundred forty-three million, one hundred twenty-two thousand, four hundred two".