30311021 has 8 divisors (see below), whose sum is σ = 32686080. Its totient is φ = 27942192.

The previous prime is 30310979. The next prime is 30311041. The reversal of 30311021 is 12011303.

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-30311021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30310993 and 30311011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30311041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15716 + ... + 17538.

It is an arithmetic number, because the mean of its divisors is an integer number (4085760).

Almost surely, 2^30311021 is an apocalyptic number.

It is an amenable number.

30311021 is a deficient number, since it is larger than the sum of its proper divisors (2375059).

30311021 is a wasteful number, since it uses less digits than its factorization.

30311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3115.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 30311021 is about 5505.5445688869. The cubic root of 30311021 is about 311.7933549734.

Adding to 30311021 its reverse (12011303), we get a palindrome (42322324).

The spelling of 30311021 in words is "thirty million, three hundred eleven thousand, twenty-one".