21400323311 has 4 divisors (see below), whose sum is σ = 21475943112. Its totient is φ = 21324703512.

The previous prime is 21400323293. The next prime is 21400323331. The reversal of 21400323311 is 11332300412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21400323311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400323331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37809476 + ... + 37810041.

It is an arithmetic number, because the mean of its divisors is an integer number (5368985778).

Almost surely, 2^21400323311 is an apocalyptic number.

21400323311 is a deficient number, since it is larger than the sum of its proper divisors (75619801).

21400323311 is an equidigital number, since it uses as much as digits as its factorization.

21400323311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75619800.

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

Adding to 21400323311 its reverse (11332300412), we get a palindrome (32732623723).

The spelling of 21400323311 in words is "twenty-one billion, four hundred million, three hundred twenty-three thousand, three hundred eleven".