30123021 has 8 divisors (see below), whose sum is σ = 40258944. Its totient is φ = 20034560.

The previous prime is 30123019. The next prime is 30123047. The reversal of 30123021 is 12032103.

It is a happy number.

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 30123021 - 2¹ = 30123019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30122988 and 30123006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30123001) 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, 10356 + ... + 12941.

It is an arithmetic number, because the mean of its divisors is an integer number (5032368).

Almost surely, 2^30123021 is an apocalyptic number.

It is an amenable number.

30123021 is a deficient number, since it is larger than the sum of its proper divisors (10135923).

30123021 is a wasteful number, since it uses less digits than its factorization.

30123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23731.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 30123021 is about 5488.4443151042. Note that the first 3 decimals coincide. The cubic root of 30123021 is about 311.1473989655.

Adding to 30123021 its reverse (12032103), we get a palindrome (42155124).

The spelling of 30123021 in words is "thirty million, one hundred twenty-three thousand, twenty-one".