21306224201 has 2 divisors, whose sum is σ = 21306224202. Its totient is φ = 21306224200.

The previous prime is 21306224183. The next prime is 21306224213. The reversal of 21306224201 is 10242260312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16910401600 + 4395822601 = 130040^2 + 66301^2 .

It is a cyclic number.

It is not a de Polignac number, because 21306224201 - 2¹⁸ = 21305962057 is a prime.

It is not a weakly prime, because it can be changed into another prime (21306224231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10653112100 + 10653112101.

It is an arithmetic number, because the mean of its divisors is an integer number (10653112101).

Almost surely, 2^21306224201 is an apocalyptic number.

It is an amenable number.

21306224201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21306224201 is an equidigital number, since it uses as much as digits as its factorization.

21306224201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21306224201 its reverse (10242260312), we get a palindrome (31548484513).

The spelling of 21306224201 in words is "twenty-one billion, three hundred six million, two hundred twenty-four thousand, two hundred one".