21202201 has 2 divisors, whose sum is σ = 21202202. Its totient is φ = 21202200.

The previous prime is 21202199. The next prime is 21202211. The reversal of 21202201 is 10220212.

It is an a-pointer prime, because the next prime (21202211) can be obtained adding 21202201 to its sum of digits (10).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14622976 + 6579225 = 3824^2 + 2565^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202201 - 2¹ = 21202199 is a prime.

Together with 21202199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21202211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601100 + 10601101.

It is an arithmetic number, because the mean of its divisors is an integer number (10601101).

Almost surely, 2^21202201 is an apocalyptic number.

It is an amenable number.

21202201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202201 is an equidigital number, since it uses as much as digits as its factorization.

21202201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21202201 is about 4604.5847804118. The cubic root of 21202201 is about 276.7750783985.

Adding to 21202201 its reverse (10220212), we get a palindrome (31422413).

The spelling of 21202201 in words is "twenty-one million, two hundred two thousand, two hundred one".