21232121201 has 2 divisors, whose sum is σ = 21232121202. Its totient is φ = 21232121200.

The previous prime is 21232121167. The next prime is 21232121213. The reversal of 21232121201 is 10212123212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21213631201 + 18490000 = 145649^2 + 4300^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232121201 - 2³⁰ = 20158379377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21232121201.

It is not a weakly prime, because it can be changed into another prime (21222121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616060600 + 10616060601.

It is an arithmetic number, because the mean of its divisors is an integer number (10616060601).

Almost surely, 2^21232121201 is an apocalyptic number.

It is an amenable number.

21232121201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232121201 is an equidigital number, since it uses as much as digits as its factorization.

21232121201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21232121201 its reverse (10212123212), we get a palindrome (31444244413).

The spelling of 21232121201 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred one".