201830021 has 8 divisors (see below), whose sum is σ = 205498944. Its totient is φ = 198190720.

The previous prime is 201830011. The next prime is 201830059. The reversal of 201830021 is 120038102.

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

It is a de Polignac number, because none of the positive numbers 2^k-201830021 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 (201830011) 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 7 ways as a sum of consecutive naturals, for example, 6581 + ... + 21141.

It is an arithmetic number, because the mean of its divisors is an integer number (25687368).

Almost surely, 2^201830021 is an apocalyptic number.

It is an amenable number.

201830021 is a deficient number, since it is larger than the sum of its proper divisors (3668923).

201830021 is a wasteful number, since it uses less digits than its factorization.

201830021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14811.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 201830021 is about 14206.6893046902. The cubic root of 201830021 is about 586.5818061585.

Adding to 201830021 its reverse (120038102), we get a palindrome (321868123).

The spelling of 201830021 in words is "two hundred one million, eight hundred thirty thousand, twenty-one".