21131413123 has 2 divisors, whose sum is σ = 21131413124. Its totient is φ = 21131413122.

The previous prime is 21131413109. The next prime is 21131413129. The reversal of 21131413123 is 32131413112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21131413123 - 2⁹ = 21131412611 is a prime.

It is a super-2 number, since 2×21131413123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21131413094 and 21131413103.

It is not a weakly prime, because it can be changed into another prime (21131413129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565706561 + 10565706562.

It is an arithmetic number, because the mean of its divisors is an integer number (10565706562).

Almost surely, 2^21131413123 is an apocalyptic number.

21131413123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131413123 is an equidigital number, since it uses as much as digits as its factorization.

21131413123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

Adding to 21131413123 its reverse (32131413112), we get a palindrome (53262826235).

The spelling of 21131413123 in words is "twenty-one billion, one hundred thirty-one million, four hundred thirteen thousand, one hundred twenty-three".