21101200220129 has 2 divisors, whose sum is σ = 21101200220130. Its totient is φ = 21101200220128.

The previous prime is 21101200220081. The next prime is 21101200220131. The reversal of 21101200220129 is 92102200210112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13456777049104 + 7644423171025 = 3668348^2 + 2764855^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101200220129 - 2⁸ = 21101200219873 is a prime.

Together with 21101200220131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21101200220729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550600110064 + 10550600110065.

It is an arithmetic number, because the mean of its divisors is an integer number (10550600110065).

Almost surely, 2^{21101200220129} is an apocalyptic number.

It is an amenable number.

21101200220129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101200220129 is an equidigital number, since it uses as much as digits as its factorization.

21101200220129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21101200220129 in words is "twenty-one trillion, one hundred one billion, two hundred million, two hundred twenty thousand, one hundred twenty-nine".