21123310283 has 2 divisors, whose sum is σ = 21123310284. Its totient is φ = 21123310282.

The previous prime is 21123310253. The next prime is 21123310289. The reversal of 21123310283 is 38201332112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21123310283 - 2¹⁸ = 21123048139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21123310289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561655141 + 10561655142.

It is an arithmetic number, because the mean of its divisors is an integer number (10561655142).

Almost surely, 2^21123310283 is an apocalyptic number.

21123310283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123310283 is an equidigital number, since it uses as much as digits as its factorization.

21123310283 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21123310283 its reverse (38201332112), we get a palindrome (59324642395).

The spelling of 21123310283 in words is "twenty-one billion, one hundred twenty-three million, three hundred ten thousand, two hundred eighty-three".