221201201020121 has 16 divisors (see below), whose sum is σ = 258843827473920. Its totient is φ = 185089928982720.

The previous prime is 221201201020087. The next prime is 221201201020127. The reversal of 221201201020121 is 121020102102122.

221201201020121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221201201020121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221201201020121.

It is not an unprimeable number, because it can be changed into a prime (221201201020127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 864067490 + ... + 864323451.

It is an arithmetic number, because the mean of its divisors is an integer number (16177739217120).

Almost surely, 2^{221201201020121} is an apocalyptic number.

It is an amenable number.

221201201020121 is a deficient number, since it is larger than the sum of its proper divisors (37642626453799).

221201201020121 is a wasteful number, since it uses less digits than its factorization.

221201201020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728391384.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221201201020121 its reverse (121020102102122), we get a palindrome (342221303122243).

The spelling of 221201201020121 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred one million, twenty thousand, one hundred twenty-one".