721242210925 has 12 divisors (see below), whose sum is σ = 894369512020. Its totient is φ = 576974949120.

The previous prime is 721242210907. The next prime is 721242210937. The reversal of 721242210925 is 529012242127.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2080545769 + 719161665156 = 45613^2 + 848034^2 .

It is not a de Polignac number, because 721242210925 - 2¹¹ = 721242208877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338599 + ... + 1247851.

Almost surely, 2^721242210925 is an apocalyptic number.

It is an amenable number.

721242210925 is a deficient number, since it is larger than the sum of its proper divisors (173127301095).

721242210925 is a wasteful number, since it uses less digits than its factorization.

721242210925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940992 (or 940987 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 721242210925 in words is "seven hundred twenty-one billion, two hundred forty-two million, two hundred ten thousand, nine hundred twenty-five".