30155021 has 8 divisors (see below), whose sum is σ = 32724384. Its totient is φ = 27621360.

The previous prime is 30155017. The next prime is 30155053. The reversal of 30155021 is 12055103.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30155021 - 2² = 30155017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30155221) 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, 7151 + ... + 10556.

It is an arithmetic number, because the mean of its divisors is an integer number (4090548).

Almost surely, 2^30155021 is an apocalyptic number.

It is an amenable number.

30155021 is a deficient number, since it is larger than the sum of its proper divisors (2569363).

30155021 is a wasteful number, since it uses less digits than its factorization.

30155021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17851.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 30155021 is about 5491.3587571748. The cubic root of 30155021 is about 311.2575383517.

The spelling of 30155021 in words is "thirty million, one hundred fifty-five thousand, twenty-one".