21212102201201 has 2 divisors, whose sum is σ = 21212102201202. Its totient is φ = 21212102201200.

The previous prime is 21212102201161. The next prime is 21212102201209. The reversal of 21212102201201 is 10210220121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11738510674801 + 9473591526400 = 3426151^2 + 3077920^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212102201201 - 2⁴² = 16814055690097 is a prime.

It is a super-3 number, since 3×21212102201201³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21212102201201.

It is not a weakly prime, because it can be changed into another prime (21212102201209) 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, 10606051100600 + 10606051100601.

It is an arithmetic number, because the mean of its divisors is an integer number (10606051100601).

Almost surely, 2^{21212102201201} is an apocalyptic number.

It is an amenable number.

21212102201201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212102201201 is an equidigital number, since it uses as much as digits as its factorization.

21212102201201 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 21212102201201 its reverse (10210220121212), we get a palindrome (31422322322413).

The spelling of 21212102201201 in words is "twenty-one trillion, two hundred twelve billion, one hundred two million, two hundred one thousand, two hundred one".