21301133123 has 2 divisors, whose sum is σ = 21301133124. Its totient is φ = 21301133122.

The previous prime is 21301133081. The next prime is 21301133131. The reversal of 21301133123 is 32133110312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301133123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301133095 and 21301133104.

It is not a weakly prime, because it can be changed into another prime (21301133023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650566561 + 10650566562.

It is an arithmetic number, because the mean of its divisors is an integer number (10650566562).

Almost surely, 2^21301133123 is an apocalyptic number.

21301133123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301133123 is an equidigital number, since it uses as much as digits as its factorization.

21301133123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21301133123 its reverse (32133110312), we get a palindrome (53434243435).

The spelling of 21301133123 in words is "twenty-one billion, three hundred one million, one hundred thirty-three thousand, one hundred twenty-three".