30132721 has 8 divisors (see below), whose sum is σ = 32343624. Its totient is φ = 27970560.

The previous prime is 30132709. The next prime is 30132743. The reversal of 30132721 is 12723103.

It can be written as a sum of positive squares in 4 ways, for example, as 17430625 + 12702096 = 4175^2 + 3564^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 30132721 - 2⁹ = 30132209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30132701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10900 + ... + 13381.

It is an arithmetic number, because the mean of its divisors is an integer number (4042953).

Almost surely, 2^30132721 is an apocalyptic number.

It is an amenable number.

30132721 is a deficient number, since it is larger than the sum of its proper divisors (2210903).

30132721 is a wasteful number, since it uses less digits than its factorization.

30132721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24371.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 30132721 is about 5489.3279187893. The cubic root of 30132721 is about 311.1807932020.

Adding to 30132721 its reverse (12723103), we get a palindrome (42855824).

The spelling of 30132721 in words is "thirty million, one hundred thirty-two thousand, seven hundred twenty-one".