21400311323 has 2 divisors, whose sum is σ = 21400311324. Its totient is φ = 21400311322.

The previous prime is 21400311299. The next prime is 21400311329. The reversal of 21400311323 is 32311300412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21400311323 - 2⁶ = 21400311259 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21400311295 and 21400311304.

It is not a weakly prime, because it can be changed into another prime (21400311329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700155661 + 10700155662.

It is an arithmetic number, because the mean of its divisors is an integer number (10700155662).

Almost surely, 2^21400311323 is an apocalyptic number.

21400311323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400311323 is an equidigital number, since it uses as much as digits as its factorization.

21400311323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21400311323 its reverse (32311300412), we get a palindrome (53711611735).

The spelling of 21400311323 in words is "twenty-one billion, four hundred million, three hundred eleven thousand, three hundred twenty-three".