202100123 has 2 divisors, whose sum is σ = 202100124. Its totient is φ = 202100122.

The previous prime is 202100069. The next prime is 202100153. The reversal of 202100123 is 321001202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 202100123 - 2¹⁰ = 202099099 is a prime.

It is not a weakly prime, because it can be changed into another prime (202100153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101050061 + 101050062.

It is an arithmetic number, because the mean of its divisors is an integer number (101050062).

Almost surely, 2^202100123 is an apocalyptic number.

202100123 is a deficient number, since it is larger than the sum of its proper divisors (1).

202100123 is an equidigital number, since it uses as much as digits as its factorization.

202100123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 202100123 is about 14216.1922820423. The cubic root of 202100123 is about 586.8433567674.

Adding to 202100123 its reverse (321001202), we get a palindrome (523101325).

The spelling of 202100123 in words is "two hundred two million, one hundred thousand, one hundred twenty-three".