30331645721 has 8 divisors (see below), whose sum is σ = 32805045000. Its totient is φ = 27878274432.

The previous prime is 30331645703. The next prime is 30331645753. The reversal of 30331645721 is 12754613303.

It can be written as a sum of positive squares in 4 ways, for example, as 838392025 + 29493253696 = 28955^2 + 171736^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30331645721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30331645621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5003846 + ... + 5009903.

It is an arithmetic number, because the mean of its divisors is an integer number (4100630625).

Almost surely, 2^30331645721 is an apocalyptic number.

It is an amenable number.

30331645721 is a deficient number, since it is larger than the sum of its proper divisors (2473399279).

30331645721 is a wasteful number, since it uses less digits than its factorization.

30331645721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10013995.

The product of its (nonzero) digits is 45360, while the sum is 35.

The spelling of 30331645721 in words is "thirty billion, three hundred thirty-one million, six hundred forty-five thousand, seven hundred twenty-one".