201022001 has 4 divisors (see below), whose sum is σ = 209762112. Its totient is φ = 192281892.

The previous prime is 201021973. The next prime is 201022007. The reversal of 201022001 is 100220102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201022001 - 2⁶ = 201021937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201022001.

It is not an unprimeable number, because it can be changed into a prime (201022007) 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 3 ways as a sum of consecutive naturals, for example, 4370021 + ... + 4370066.

It is an arithmetic number, because the mean of its divisors is an integer number (52440528).

Almost surely, 2^201022001 is an apocalyptic number.

It is an amenable number.

201022001 is a deficient number, since it is larger than the sum of its proper divisors (8740111).

201022001 is an equidigital number, since it uses as much as digits as its factorization.

201022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8740110.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 201022001 is about 14178.2227729712. Note that the first 3 decimals coincide. The cubic root of 201022001 is about 585.7979720740.

Adding to 201022001 its reverse (100220102), we get a palindrome (301242103).

The spelling of 201022001 in words is "two hundred one million, twenty-two thousand, one".