21102201221201 has 16 divisors (see below), whose sum is σ = 21392101969920. Its totient is φ = 20814046050000.

The previous prime is 21102201221107. The next prime is 21102201221207. The reversal of 21102201221201 is 10212210220112.

It is a cyclic number.

It is not a de Polignac number, because 21102201221201 - 2¹⁸ = 21102200959057 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 21102201221201.

It is not an unprimeable number, because it can be changed into a prime (21102201221207) 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, 160711826 + ... + 160843076.

It is an arithmetic number, because the mean of its divisors is an integer number (1337006373120).

Almost surely, 2^{21102201221201} is an apocalyptic number.

It is an amenable number.

21102201221201 is a deficient number, since it is larger than the sum of its proper divisors (289900748719).

21102201221201 is a wasteful number, since it uses less digits than its factorization.

21102201221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137884.

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

Adding to 21102201221201 its reverse (10212210220112), we get a palindrome (31314411441313).

The spelling of 21102201221201 in words is "twenty-one trillion, one hundred two billion, two hundred one million, two hundred twenty-one thousand, two hundred one".