21212200202101 has 2 divisors, whose sum is σ = 21212200202102. Its totient is φ = 21212200202100.

The previous prime is 21212200202047. The next prime is 21212200202131. The reversal of 21212200202101 is 10120200221212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21073332924900 + 138867277201 = 4590570^2 + 372649^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212200202101 - 2⁹ = 21212200201589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212200202131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606100101050 + 10606100101051.

It is an arithmetic number, because the mean of its divisors is an integer number (10606100101051).

Almost surely, 2^{21212200202101} is an apocalyptic number.

It is an amenable number.

21212200202101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212200202101 is an equidigital number, since it uses as much as digits as its factorization.

21212200202101 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 16.

Adding to 21212200202101 its reverse (10120200221212), we get a palindrome (31332400423313).

The spelling of 21212200202101 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, two hundred two thousand, one hundred one".