201020211020121 has 16 divisors (see below), whose sum is σ = 268306203161088. Its totient is φ = 133873855315200.

The previous prime is 201020211020107. The next prime is 201020211020131. The reversal of 201020211020121 is 121020112020102.

It is not a de Polignac number, because 201020211020121 - 2⁵ = 201020211020089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201020211020121.

It is not an unprimeable number, because it can be changed into a prime (201020211020131) 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 15 ways as a sum of consecutive naturals, for example, 90894945 + ... + 93080241.

It is an arithmetic number, because the mean of its divisors is an integer number (16769137697568).

Almost surely, 2^{201020211020121} is an apocalyptic number.

It is an amenable number.

201020211020121 is a deficient number, since it is larger than the sum of its proper divisors (67285992140967).

201020211020121 is a wasteful number, since it uses less digits than its factorization.

201020211020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217232.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201020211020121 its reverse (121020112020102), we get a palindrome (322040323040223).

The spelling of 201020211020121 in words is "two hundred one trillion, twenty billion, two hundred eleven million, twenty thousand, one hundred twenty-one".