21012200101 has 2 divisors, whose sum is σ = 21012200102. Its totient is φ = 21012200100.

The previous prime is 21012200081. The next prime is 21012200119. The reversal of 21012200101 is 10100221012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21009053025 + 3147076 = 144945^2 + 1774^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012200101 - 2²⁷ = 20877982373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012200191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506100050 + 10506100051.

It is an arithmetic number, because the mean of its divisors is an integer number (10506100051).

Almost surely, 2^21012200101 is an apocalyptic number.

It is an amenable number.

21012200101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012200101 is an equidigital number, since it uses as much as digits as its factorization.

21012200101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21012200101 its reverse (10100221012), we get a palindrome (31112421113).

The spelling of 21012200101 in words is "twenty-one billion, twelve million, two hundred thousand, one hundred one".