202121189 has 2 divisors, whose sum is σ = 202121190. Its totient is φ = 202121188.

The previous prime is 202121137. The next prime is 202121191. The reversal of 202121189 is 981121202.

202121189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198669025 + 3452164 = 14095^2 + 1858^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121189 - 2¹² = 202117093 is a prime.

Together with 202121191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202123189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060594 + 101060595.

It is an arithmetic number, because the mean of its divisors is an integer number (101060595).

Almost surely, 2^202121189 is an apocalyptic number.

It is an amenable number.

202121189 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121189 is an equidigital number, since it uses as much as digits as its factorization.

202121189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 202121189 is about 14216.9331784320. The cubic root of 202121189 is about 586.8637460221.

The spelling of 202121189 in words is "two hundred two million, one hundred twenty-one thousand, one hundred eighty-nine".