202120121989 has 2 divisors, whose sum is σ = 202120121990. Its totient is φ = 202120121988.

The previous prime is 202120121941. The next prime is 202120122101. The reversal of 202120121989 is 989121021202.

202120121989 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., 200293841764 + 1826280225 = 447542^2 + 42735^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120121989 - 2¹¹ = 202120119941 is a prime.

It is a super-2 number, since 2×202120121989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202120121939) 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, 101060060994 + 101060060995.

It is an arithmetic number, because the mean of its divisors is an integer number (101060060995).

Almost surely, 2^202120121989 is an apocalyptic number.

It is an amenable number.

202120121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120121989 is an equidigital number, since it uses as much as digits as its factorization.

202120121989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 202120121989 in words is "two hundred two billion, one hundred twenty million, one hundred twenty-one thousand, nine hundred eighty-nine".