21322601 has 2 divisors, whose sum is σ = 21322602. Its totient is φ = 21322600.

The previous prime is 21322571. The next prime is 21322621. The reversal of 21322601 is 10622312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20241001 + 1081600 = 4499^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322601 - 2¹⁰ = 21321577 is a prime.

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 21322601.

It is not a weakly prime, because it can be changed into another prime (21322621) 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, 10661300 + 10661301.

It is an arithmetic number, because the mean of its divisors is an integer number (10661301).

Almost surely, 2^21322601 is an apocalyptic number.

It is an amenable number.

21322601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322601 is an equidigital number, since it uses as much as digits as its factorization.

21322601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21322601 is about 4617.6401981965. The cubic root of 21322601 is about 277.2979932869.

Adding to 21322601 its reverse (10622312), we get a palindrome (31944913).

The spelling of 21322601 in words is "twenty-one million, three hundred twenty-two thousand, six hundred one".