30121072 has 20 divisors (see below), whose sum is σ = 58511880. Its totient is φ = 15021248.

The previous prime is 30121051. The next prime is 30121073. The reversal of 30121072 is 27012103.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30121073) 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 3 ways as a sum of consecutive naturals, for example, 4458 + ... + 8950.

It is an arithmetic number, because the mean of its divisors is an integer number (2925594).

Almost surely, 2^30121072 is an apocalyptic number.

It is an amenable number.

30121072 is a deficient number, since it is larger than the sum of its proper divisors (28390808).

30121072 is a wasteful number, since it uses less digits than its factorization.

30121072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4920 (or 4914 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 30121072 is about 5488.2667573652. The cubic root of 30121072 is about 311.1406882689.

Adding to 30121072 its reverse (27012103), we get a palindrome (57133175).

The spelling of 30121072 in words is "thirty million, one hundred twenty-one thousand, seventy-two".