30156021 has 72 divisors (see below), whose sum is σ = 55130400. Its totient is φ = 15785280.

The previous prime is 30156019. The next prime is 30156037. The reversal of 30156021 is 12065103.

It is not a de Polignac number, because 30156021 - 2¹ = 30156019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30155985 and 30156003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30156041) 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 71 ways as a sum of consecutive naturals, for example, 494331 + ... + 494391.

It is an arithmetic number, because the mean of its divisors is an integer number (765700).

Almost surely, 2^30156021 is an apocalyptic number.

It is an amenable number.

30156021 is a deficient number, since it is larger than the sum of its proper divisors (24974379).

30156021 is a wasteful number, since it uses less digits than its factorization.

30156021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 30156021 is about 5491.4498085660. The cubic root of 30156021 is about 311.2609789518.

The spelling of 30156021 in words is "thirty million, one hundred fifty-six thousand, twenty-one".