21202111210129 has 2 divisors, whose sum is σ = 21202111210130. Its totient is φ = 21202111210128.

The previous prime is 21202111210081. The next prime is 21202111210199. The reversal of 21202111210129 is 92101211120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18510198313104 + 2691912897025 = 4302348^2 + 1640705^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202111210129 - 2²⁵ = 21202077655697 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202111210199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601055605064 + 10601055605065.

It is an arithmetic number, because the mean of its divisors is an integer number (10601055605065).

Almost surely, 2^{21202111210129} is an apocalyptic number.

It is an amenable number.

21202111210129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202111210129 is an equidigital number, since it uses as much as digits as its factorization.

21202111210129 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 25.

The spelling of 21202111210129 in words is "twenty-one trillion, two hundred two billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-nine".