202123013009 has 2 divisors, whose sum is σ = 202123013010. Its totient is φ = 202123013008.

The previous prime is 202123012991. The next prime is 202123013011. The reversal of 202123013009 is 900310321202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167058577984 + 35064435025 = 408728^2 + 187255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202123013009 is a prime.

Together with 202123013011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (202123013909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101061506504 + 101061506505.

It is an arithmetic number, because the mean of its divisors is an integer number (101061506505).

Almost surely, 2^202123013009 is an apocalyptic number.

It is an amenable number.

202123013009 is a deficient number, since it is larger than the sum of its proper divisors (1).

202123013009 is an equidigital number, since it uses as much as digits as its factorization.

202123013009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 202123013009 in words is "two hundred two billion, one hundred twenty-three million, thirteen thousand, nine".