21002222120201 has 32 divisors (see below), whose sum is σ = 25016713505280. Its totient is φ = 17250914419200.

The previous prime is 21002222120161. The next prime is 21002222120203. The reversal of 21002222120201 is 10202122220012.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21002222120201 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002222120201.

It is not an unprimeable number, because it can be changed into a prime (21002222120203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21939941 + ... + 22877181.

It is an arithmetic number, because the mean of its divisors is an integer number (781772297040).

Almost surely, 2^{21002222120201} is an apocalyptic number.

It is an amenable number.

21002222120201 is a deficient number, since it is larger than the sum of its proper divisors (4014491385079).

21002222120201 is a wasteful number, since it uses less digits than its factorization.

21002222120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938105.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21002222120201 its reverse (10202122220012), we get a palindrome (31204344340213).

The spelling of 21002222120201 in words is "twenty-one trillion, two billion, two hundred twenty-two million, one hundred twenty thousand, two hundred one".