21311401423 has 6 divisors (see below), whose sum is σ = 23076843144. Its totient is φ = 19672062696.

The previous prime is 21311401373. The next prime is 21311401513. The reversal of 21311401423 is 32410411312.

It is not a de Polignac number, because 21311401423 - 2⁹ = 21311400911 is a prime.

It is a super-2 number, since 2×21311401423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21311401394 and 21311401403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311401523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63051315 + ... + 63051652.

It is an arithmetic number, because the mean of its divisors is an integer number (3846140524).

Almost surely, 2^21311401423 is an apocalyptic number.

21311401423 is a deficient number, since it is larger than the sum of its proper divisors (1765441721).

21311401423 is a wasteful number, since it uses less digits than its factorization.

21311401423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126102993 (or 126102980 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21311401423 its reverse (32410411312), we get a palindrome (53721812735).

The spelling of 21311401423 in words is "twenty-one billion, three hundred eleven million, four hundred one thousand, four hundred twenty-three".