201230021 has 8 divisors (see below), whose sum is σ = 208217088. Its totient is φ = 194274000.

The previous prime is 201229997. The next prime is 201230063. The reversal of 201230021 is 120032102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 201230021 - 2⁶ = 201229957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201229984 and 201230011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201230621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5831 + ... + 20891.

It is an arithmetic number, because the mean of its divisors is an integer number (26027136).

Almost surely, 2^201230021 is an apocalyptic number.

It is an amenable number.

201230021 is a deficient number, since it is larger than the sum of its proper divisors (6987067).

201230021 is a wasteful number, since it uses less digits than its factorization.

201230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15523.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 201230021 is about 14185.5567744097. The cubic root of 201230021 is about 585.9999660256. Note that the first 4 decimals are identical.

Adding to 201230021 its reverse (120032102), we get a palindrome (321262123).

The spelling of 201230021 in words is "two hundred one million, two hundred thirty thousand, twenty-one".