21221132201 has 2 divisors, whose sum is σ = 21221132202. Its totient is φ = 21221132200.

The previous prime is 21221132173. The next prime is 21221132311. The reversal of 21221132201 is 10223112212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21072877225 + 148254976 = 145165^2 + 12176^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221132201 - 2¹⁸ = 21220870057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221132201.

It is not a weakly prime, because it can be changed into another prime (21221134201) 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, 10610566100 + 10610566101.

It is an arithmetic number, because the mean of its divisors is an integer number (10610566101).

Almost surely, 2^21221132201 is an apocalyptic number.

It is an amenable number.

21221132201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221132201 is an equidigital number, since it uses as much as digits as its factorization.

21221132201 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 21221132201 its reverse (10223112212), we get a palindrome (31444244413).

The spelling of 21221132201 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred one".