21452201 has 2 divisors, whose sum is σ = 21452202. Its totient is φ = 21452200.

The previous prime is 21452191. The next prime is 21452203. The reversal of 21452201 is 10225412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15202201 + 6250000 = 3899^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 21452201 - 2²² = 17257897 is a prime.

Together with 21452203, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21452201.

It is not a weakly prime, because it can be changed into another prime (21452203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726100 + 10726101.

It is an arithmetic number, because the mean of its divisors is an integer number (10726101).

Almost surely, 2^21452201 is an apocalyptic number.

It is an amenable number.

21452201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21452201 is an equidigital number, since it uses as much as digits as its factorization.

21452201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21452201 is about 4631.6520810614. The cubic root of 21452201 is about 277.8586699461.

Adding to 21452201 its reverse (10225412), we get a palindrome (31677613).

The spelling of 21452201 in words is "twenty-one million, four hundred fifty-two thousand, two hundred one".