30603698907721 has 9 divisors (see below), whose sum is σ = 30826227911661. Its totient is φ = 30382764987564.

The previous prime is 30603698907713. The next prime is 30603698907823. The reversal of 30603698907721 is 12770989630603.

The square root of 30603698907721 is 5532061.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 30603698907721 - 2³ = 30603698907713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30603698907721.

It is not an unprimeable number, because it can be changed into a prime (30603698907701) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 768936580 + ... + 768976378.

It is an arithmetic number, because the mean of its divisors is an integer number (3425136434629).

Almost surely, 2^{30603698907721} is an apocalyptic number.

30603698907721 is the 5532061-st square number.

30603698907721 is the 2766031-st centered octagonal number.

It is an amenable number.

30603698907721 is a deficient number, since it is larger than the sum of its proper divisors (222529003940).

30603698907721 is an frugal number, since it uses more digits than its factorization.

30603698907721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79876 (or 39938 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 61.

The spelling of 30603698907721 in words is "thirty trillion, six hundred three billion, six hundred ninety-eight million, nine hundred seven thousand, seven hundred twenty-one".