30013021 has 4 divisors (see below), whose sum is σ = 30249472. Its totient is φ = 29776572.

The previous prime is 30013003. The next prime is 30013033. The reversal of 30013021 is 12031003.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30013021 - 2¹¹ = 30010973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30012989 and 30013007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30013051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118035 + ... + 118288.

It is an arithmetic number, because the mean of its divisors is an integer number (7562368).

Almost surely, 2^30013021 is an apocalyptic number.

It is an amenable number.

30013021 is a deficient number, since it is larger than the sum of its proper divisors (236451).

30013021 is a wasteful number, since it uses less digits than its factorization.

30013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236450.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 30013021 is about 5478.4140953382. The cubic root of 30013021 is about 310.7681988424.

Adding to 30013021 its reverse (12031003), we get a palindrome (42044024).

The spelling of 30013021 in words is "thirty million, thirteen thousand, twenty-one".