721621265004420 has 192 divisors, whose sum is σ = 2359562844441600. Its totient is φ = 162922196067840.

The previous prime is 721621265004383. The next prime is 721621265004427. The reversal of 721621265004420 is 24400562126127.

It is not an unprimeable number, because it can be changed into a prime (721621265004427) 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 63 ways as a sum of consecutive naturals, for example, 486934339 + ... + 488414058.

It is an arithmetic number, because the mean of its divisors is an integer number (12289389814800).

Almost surely, 2^{721621265004420} is an apocalyptic number.

It is an amenable number.

721621265004420 is an abundant number, since it is smaller than the sum of its proper divisors (1637941579437180).

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

721621265004420 is a wasteful number, since it uses less digits than its factorization.

721621265004420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975348498 (or 975348496 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The spelling of 721621265004420 in words is "seven hundred twenty-one trillion, six hundred twenty-one billion, two hundred sixty-five million, four thousand, four hundred twenty".