21120221210201 has 2 divisors, whose sum is σ = 21120221210202. Its totient is φ = 21120221210200.

The previous prime is 21120221210161. The next prime is 21120221210251. The reversal of 21120221210201 is 10201212202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17129036348176 + 3991184862025 = 4138724^2 + 1997795^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120221210201 - 2¹⁴ = 21120221193817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120221210201.

It is not a weakly prime, because it can be changed into another prime (21120221210251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560110605100 + 10560110605101.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110605101).

Almost surely, 2^{21120221210201} is an apocalyptic number.

It is an amenable number.

21120221210201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120221210201 is an equidigital number, since it uses as much as digits as its factorization.

21120221210201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120221210201 its reverse (10201212202112), we get a palindrome (31321433412313).

The spelling of 21120221210201 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred one".