21183020123 has 2 divisors, whose sum is σ = 21183020124. Its totient is φ = 21183020122.

The previous prime is 21183020087. The next prime is 21183020141. The reversal of 21183020123 is 32102038112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21183020123 - 2¹² = 21183016027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21183022123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10591510061 + 10591510062.

It is an arithmetic number, because the mean of its divisors is an integer number (10591510062).

Almost surely, 2^21183020123 is an apocalyptic number.

21183020123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183020123 is an equidigital number, since it uses as much as digits as its factorization.

21183020123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21183020123 its reverse (32102038112), we get a palindrome (53285058235).

The spelling of 21183020123 in words is "twenty-one billion, one hundred eighty-three million, twenty thousand, one hundred twenty-three".