201021110001 has 24 divisors (see below), whose sum is σ = 298781949440. Its totient is φ = 130142642976.

The previous prime is 201021109967. The next prime is 201021110011. The reversal of 201021110001 is 100011120102.

It is a happy number.

It is not a de Polignac number, because 201021110001 - 2⁶ = 201021109937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201021110011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402961 + ... + 751278.

Almost surely, 2^201021110001 is an apocalyptic number.

It is an amenable number.

201021110001 is a deficient number, since it is larger than the sum of its proper divisors (97760839439).

201021110001 is a wasteful number, since it uses less digits than its factorization.

201021110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154805 (or 1154802 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 201021110001 its reverse (100011120102), we get a palindrome (301032230103).

The spelling of 201021110001 in words is "two hundred one billion, twenty-one million, one hundred ten thousand, one".