721021365334744 has 16 divisors (see below), whose sum is σ = 1384888598052120. Its totient is φ = 351717739187520.

The previous prime is 721021365334691. The next prime is 721021365334747. The reversal of 721021365334744 is 447433563120127.

It is a junction number, because it is equal to n+sod(n) for n = 721021365334691 and 721021365334700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721021365334747) 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, 1099117934634 + ... + 1099117935289.

Almost surely, 2^{721021365334744} is an apocalyptic number.

It is an amenable number.

721021365334744 is a deficient number, since it is larger than the sum of its proper divisors (663867232717376).

721021365334744 is a wasteful number, since it uses less digits than its factorization.

721021365334744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198235869970 (or 2198235869966 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 52.

The spelling of 721021365334744 in words is "seven hundred twenty-one trillion, twenty-one billion, three hundred sixty-five million, three hundred thirty-four thousand, seven hundred forty-four".