21210122201 has 2 divisors, whose sum is σ = 21210122202. Its totient is φ = 21210122200.

The previous prime is 21210122179. The next prime is 21210122207. The reversal of 21210122201 is 10222101212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19365505600 + 1844616601 = 139160^2 + 42949^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210122201 - 2¹⁴ = 21210105817 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210122207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605061100 + 10605061101.

It is an arithmetic number, because the mean of its divisors is an integer number (10605061101).

Almost surely, 2^21210122201 is an apocalyptic number.

It is an amenable number.

21210122201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210122201 is an equidigital number, since it uses as much as digits as its factorization.

21210122201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210122201 its reverse (10222101212), we get a palindrome (31432223413).

The spelling of 21210122201 in words is "twenty-one billion, two hundred ten million, one hundred twenty-two thousand, two hundred one".