201021100101 has 24 divisors (see below), whose sum is σ = 303774516864. Its totient is φ = 127963602240.

The previous prime is 201021100097. The next prime is 201021100123. The reversal of 201021100101 is 101001120102.

It is a happy number.

It is not a de Polignac number, because 201021100101 - 2² = 201021100097 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021100801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5778111 + ... + 5812796.

It is an arithmetic number, because the mean of its divisors is an integer number (12657271536).

Almost surely, 2^201021100101 is an apocalyptic number.

It is an amenable number.

201021100101 is a deficient number, since it is larger than the sum of its proper divisors (102753416763).

201021100101 is a wasteful number, since it uses less digits than its factorization.

201021100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11591001 (or 11590998 counting only the distinct ones).

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

Adding to 201021100101 its reverse (101001120102), we get a palindrome (302022220203).

The spelling of 201021100101 in words is "two hundred one billion, twenty-one million, one hundred thousand, one hundred one".