21002212201 has 8 divisors (see below), whose sum is σ = 21292773320. Its totient is φ = 20711728512.

The previous prime is 21002212181. The next prime is 21002212207. The reversal of 21002212201 is 10221220012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 115025625 + 20887186576 = 10725^2 + 144524^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21002212201 - 2⁵ = 21002212169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002212207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720751 + ... + 749323.

It is an arithmetic number, because the mean of its divisors is an integer number (2661596665).

Almost surely, 2^21002212201 is an apocalyptic number.

It is an amenable number.

21002212201 is a deficient number, since it is larger than the sum of its proper divisors (290561119).

21002212201 is a wasteful number, since it uses less digits than its factorization.

21002212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38715.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002212201 its reverse (10221220012), we get a palindrome (31223432213).

The spelling of 21002212201 in words is "twenty-one billion, two million, two hundred twelve thousand, two hundred one".