21002112202201 has 16 divisors (see below), whose sum is σ = 22689429396480. Its totient is φ = 19325098918080.

The previous prime is 21002112202199. The next prime is 21002112202241. The reversal of 21002112202201 is 10220221120012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002112202201 - 2¹ = 21002112202199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002112202241) 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, 8825016 + ... + 10949206.

It is an arithmetic number, because the mean of its divisors is an integer number (1418089337280).

Almost surely, 2^{21002112202201} is an apocalyptic number.

It is an amenable number.

21002112202201 is a deficient number, since it is larger than the sum of its proper divisors (1687317194279).

21002112202201 is a wasteful number, since it uses less digits than its factorization.

21002112202201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126616.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002112202201 its reverse (10220221120012), we get a palindrome (31222333322213).

The spelling of 21002112202201 in words is "twenty-one trillion, two billion, one hundred twelve million, two hundred two thousand, two hundred one".