201021120101 has 4 divisors (see below), whose sum is σ = 201269601900. Its totient is φ = 200772638304.

The previous prime is 201021120061. The next prime is 201021120133. The reversal of 201021120101 is 101021120102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163984502500 + 37036617601 = 404950^2 + 192449^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021120101 - 2¹⁰ = 201021119077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201621120101) 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 3 ways as a sum of consecutive naturals, for example, 124239686 + ... + 124241303.

It is an arithmetic number, because the mean of its divisors is an integer number (50317400475).

Almost surely, 2^201021120101 is an apocalyptic number.

It is an amenable number.

201021120101 is a deficient number, since it is larger than the sum of its proper divisors (248481799).

201021120101 is an equidigital number, since it uses as much as digits as its factorization.

201021120101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248481798.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201021120101 its reverse (101021120102), we get a palindrome (302042240203).

Subtracting from 201021120101 its reverse (101021120102), we obtain a palindrome (99999999999).

The spelling of 201021120101 in words is "two hundred one billion, twenty-one million, one hundred twenty thousand, one hundred one".