201121021100021 has 16 divisors (see below), whose sum is σ = 221587829971200. Its totient is φ = 181020637512000.

The previous prime is 201121021099979. The next prime is 201121021100047. The reversal of 201121021100021 is 120001120121102.

It is a de Polignac number, because none of the positive numbers 2^k-201121021100021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201121021099969 and 201121021100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121021100081) 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 15 ways as a sum of consecutive naturals, for example, 62906141 + ... + 66025938.

It is an arithmetic number, because the mean of its divisors is an integer number (13849239373200).

Almost surely, 2^{201121021100021} is an apocalyptic number.

It is an amenable number.

201121021100021 is a deficient number, since it is larger than the sum of its proper divisors (20466808871179).

201121021100021 is a wasteful number, since it uses less digits than its factorization.

201121021100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128933500.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201121021100021 its reverse (120001120121102), we get a palindrome (321122141221123).

The spelling of 201121021100021 in words is "two hundred one trillion, one hundred twenty-one billion, twenty-one million, one hundred thousand, twenty-one".