30039021 has 6 divisors (see below), whose sum is σ = 43389710. Its totient is φ = 20026008.

The previous prime is 30039007. The next prime is 30039043. The reversal of 30039021 is 12093003.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 11634921 = 4290^2 + 3411^2 .

It is not a de Polignac number, because 30039021 - 2¹³ = 30030829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30038985 and 30039003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30039001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1668826 + ... + 1668843.

Almost surely, 2^30039021 is an apocalyptic number.

It is an amenable number.

30039021 is a deficient number, since it is larger than the sum of its proper divisors (13350689).

30039021 is a wasteful number, since it uses less digits than its factorization.

30039021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337675 (or 3337672 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 30039021 is about 5480.7865311468. The cubic root of 30039021 is about 310.8579114718.

The spelling of 30039021 in words is "thirty million, thirty-nine thousand, twenty-one".