21202112201 has 2 divisors, whose sum is σ = 21202112202. Its totient is φ = 21202112200.

The previous prime is 21202112153. The next prime is 21202112221. The reversal of 21202112201 is 10221120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18817254976 + 2384857225 = 137176^2 + 48835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202112201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202112221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601056100 + 10601056101.

It is an arithmetic number, because the mean of its divisors is an integer number (10601056101).

Almost surely, 2^21202112201 is an apocalyptic number.

It is an amenable number.

21202112201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202112201 is an equidigital number, since it uses as much as digits as its factorization.

21202112201 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 21202112201 its reverse (10221120212), we get a palindrome (31423232413).

The spelling of 21202112201 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, two hundred one".