30540021 has 8 divisors (see below), whose sum is σ = 42490560. Its totient is φ = 19474752.

The previous prime is 30540017. The next prime is 30540079. The reversal of 30540021 is 12004503.

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

It is not a de Polignac number, because 30540021 - 2² = 30540017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30540091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221236 + ... + 221373.

It is an arithmetic number, because the mean of its divisors is an integer number (5311320).

Almost surely, 2^30540021 is an apocalyptic number.

It is an amenable number.

30540021 is a deficient number, since it is larger than the sum of its proper divisors (11950539).

30540021 is a wasteful number, since it uses less digits than its factorization.

30540021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442635.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 30540021 is about 5526.3026518641. The cubic root of 30540021 is about 312.5765862424.

Adding to 30540021 its reverse (12004503), we get a palindrome (42544524).

The spelling of 30540021 in words is "thirty million, five hundred forty thousand, twenty-one".