21123310183 has 2 divisors, whose sum is σ = 21123310184. Its totient is φ = 21123310182.

The previous prime is 21123310171. The next prime is 21123310199. The reversal of 21123310183 is 38101332112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123310183 - 2²¹ = 21121213031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21123310133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561655091 + 10561655092.

It is an arithmetic number, because the mean of its divisors is an integer number (10561655092).

Almost surely, 2^21123310183 is an apocalyptic number.

21123310183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123310183 is an equidigital number, since it uses as much as digits as its factorization.

21123310183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 21123310183 its reverse (38101332112), we get a palindrome (59224642295).

The spelling of 21123310183 in words is "twenty-one billion, one hundred twenty-three million, three hundred ten thousand, one hundred eighty-three".