201121100101 has 4 divisors (see below), whose sum is σ = 201121998412. Its totient is φ = 201120201792.

The previous prime is 201121100087. The next prime is 201121100153. The reversal of 201121100101 is 101001121102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 152198295876 + 48922804225 = 390126^2 + 221185^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121100101 - 2⁵ = 201121100069 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 (201121107101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187255 + ... + 661291.

It is an arithmetic number, because the mean of its divisors is an integer number (50280499603).

Almost surely, 2^201121100101 is an apocalyptic number.

It is an amenable number.

201121100101 is a deficient number, since it is larger than the sum of its proper divisors (898311).

201121100101 is an equidigital number, since it uses as much as digits as its factorization.

201121100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898310.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 201121100101 its reverse (101001121102), we get a palindrome (302122221203).

The spelling of 201121100101 in words is "two hundred one billion, one hundred twenty-one million, one hundred thousand, one hundred one".