30056021 has 4 divisors (see below), whose sum is σ = 30187500. Its totient is φ = 29924544.

The previous prime is 30055997. The next prime is 30056087. The reversal of 30056021 is 12065003.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21996100 + 8059921 = 4690^2 + 2839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30056021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30056821) 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, 65396 + ... + 65853.

It is an arithmetic number, because the mean of its divisors is an integer number (7546875).

Almost surely, 2^30056021 is an apocalyptic number.

It is an amenable number.

30056021 is a deficient number, since it is larger than the sum of its proper divisors (131479).

30056021 is a wasteful number, since it uses less digits than its factorization.

30056021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131478.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 30056021 is about 5482.3371840849. The cubic root of 30056021 is about 310.9165417437.

The spelling of 30056021 in words is "thirty million, fifty-six thousand, twenty-one".