21100123283 has 2 divisors, whose sum is σ = 21100123284. Its totient is φ = 21100123282.

The previous prime is 21100123207. The next prime is 21100123357. The reversal of 21100123283 is 38232100112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100123283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100123183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550061641 + 10550061642.

It is an arithmetic number, because the mean of its divisors is an integer number (10550061642).

Almost surely, 2^21100123283 is an apocalyptic number.

21100123283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100123283 is an equidigital number, since it uses as much as digits as its factorization.

21100123283 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 21100123283 its reverse (38232100112), we get a palindrome (59332223395).

The spelling of 21100123283 in words is "twenty-one billion, one hundred million, one hundred twenty-three thousand, two hundred eighty-three".