202121129989 has 2 divisors, whose sum is σ = 202121129990. Its totient is φ = 202121129988.

The previous prime is 202121129953. The next prime is 202121130061. The reversal of 202121129989 is 989921121202.

It is a happy number.

202121129989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160026401089 + 42094728900 = 400033^2 + 205170^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121129989 - 2²⁹ = 201584259077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202121129929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060564994 + 101060564995.

It is an arithmetic number, because the mean of its divisors is an integer number (101060564995).

Almost surely, 2^202121129989 is an apocalyptic number.

It is an amenable number.

202121129989 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121129989 is an equidigital number, since it uses as much as digits as its factorization.

202121129989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 202121129989 in words is "two hundred two billion, one hundred twenty-one million, one hundred twenty-nine thousand, nine hundred eighty-nine".