21112321201 has 2 divisors, whose sum is σ = 21112321202. Its totient is φ = 21112321200.

The previous prime is 21112321187. The next prime is 21112321211. The reversal of 21112321201 is 10212321112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20736000000 + 376321201 = 144000^2 + 19399^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112321201 - 2⁵ = 21112321169 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112321211) 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, 10556160600 + 10556160601.

It is an arithmetic number, because the mean of its divisors is an integer number (10556160601).

Almost surely, 2^21112321201 is an apocalyptic number.

It is an amenable number.

21112321201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112321201 is an equidigital number, since it uses as much as digits as its factorization.

21112321201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21112321201 its reverse (10212321112), we get a palindrome (31324642313).

It can be divided in two parts, 211123 and 21201, that added together give a square (232324 = 482²).

The spelling of 21112321201 in words is "twenty-one billion, one hundred twelve million, three hundred twenty-one thousand, two hundred one".