30319021 has 8 divisors (see below), whose sum is σ = 31728024. Its totient is φ = 28941120.

The previous prime is 30318989. The next prime is 30319031. The reversal of 30319021 is 12091303.

It can be written as a sum of positive squares in 4 ways, for example, as 9030025 + 21288996 = 3005^2 + 4614^2 .

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 30319021 - 2⁵ = 30318989 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 30319021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30319031) 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, 5770 + ... + 9691.

It is an arithmetic number, because the mean of its divisors is an integer number (3966003).

Almost surely, 2^30319021 is an apocalyptic number.

It is an amenable number.

30319021 is a deficient number, since it is larger than the sum of its proper divisors (1409003).

30319021 is a wasteful number, since it uses less digits than its factorization.

30319021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15551.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 30319021 is about 5506.2710612537. The cubic root of 30319021 is about 311.8207831425.

The spelling of 30319021 in words is "thirty million, three hundred nineteen thousand, twenty-one".