201121010010101 has 4 divisors (see below), whose sum is σ = 212951657657772. Its totient is φ = 189290362362432.

The previous prime is 201121010010079. The next prime is 201121010010121. The reversal of 201121010010101 is 101010010121102.

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 135821519754001 + 65299490256100 = 11654249^2 + 8080810^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121010010101 - 2²² = 201121005815797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121010010121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5915323823810 + ... + 5915323823843.

It is an arithmetic number, because the mean of its divisors is an integer number (53237914414443).

Almost surely, 2^{201121010010101} is an apocalyptic number.

It is an amenable number.

201121010010101 is a deficient number, since it is larger than the sum of its proper divisors (11830647647671).

201121010010101 is a wasteful number, since it uses less digits than its factorization.

201121010010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11830647647670.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 201121010010101 its reverse (101010010121102), we get a palindrome (302131020131203).

The spelling of 201121010010101 in words is "two hundred one trillion, one hundred twenty-one billion, ten million, ten thousand, one hundred one".