21210000212101 has 2 divisors, whose sum is σ = 21210000212102. Its totient is φ = 21210000212100.

The previous prime is 21210000212069. The next prime is 21210000212119. The reversal of 21210000212101 is 10121200001212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18670436064900 + 2539564147201 = 4320930^2 + 1593601^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210000212101 - 2⁵ = 21210000212069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210000212701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605000106050 + 10605000106051.

It is an arithmetic number, because the mean of its divisors is an integer number (10605000106051).

Almost surely, 2^{21210000212101} is an apocalyptic number.

It is an amenable number.

21210000212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210000212101 is an equidigital number, since it uses as much as digits as its factorization.

21210000212101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210000212101 its reverse (10121200001212), we get a palindrome (31331200213313).

The spelling of 21210000212101 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve thousand, one hundred one".