30642521 has 16 divisors (see below), whose sum is σ = 38177664. Its totient is φ = 23946624.

The previous prime is 30642511. The next prime is 30642523. The reversal of 30642521 is 12524603.

It is not a de Polignac number, because 30642521 - 2¹⁴ = 30626137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30642523) 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 15 ways as a sum of consecutive naturals, for example, 5525 + ... + 9581.

It is an arithmetic number, because the mean of its divisors is an integer number (2386104).

Almost surely, 2^30642521 is an apocalyptic number.

It is an amenable number.

30642521 is a deficient number, since it is larger than the sum of its proper divisors (7535143).

30642521 is a wasteful number, since it uses less digits than its factorization.

30642521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 30642521 is about 5535.5687151367. The cubic root of 30642521 is about 312.9258909903.

The spelling of 30642521 in words is "thirty million, six hundred forty-two thousand, five hundred twenty-one".