20123213189 has 2 divisors, whose sum is σ = 20123213190. Its totient is φ = 20123213188.

The previous prime is 20123213111. The next prime is 20123213203. The reversal of 20123213189 is 98131232102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20119152964 + 4060225 = 141842^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123213189 - 2³² = 15828245893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123219189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061606594 + 10061606595.

It is an arithmetic number, because the mean of its divisors is an integer number (10061606595).

Almost surely, 2^20123213189 is an apocalyptic number.

It is an amenable number.

20123213189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123213189 is an equidigital number, since it uses as much as digits as its factorization.

20123213189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 20123213189 in words is "twenty billion, one hundred twenty-three million, two hundred thirteen thousand, one hundred eighty-nine".