21341123431 has 4 divisors (see below), whose sum is σ = 21341425264. Its totient is φ = 21340821600.

The previous prime is 21341123423. The next prime is 21341123473. The reversal of 21341123431 is 13432114312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21341123431 - 2³ = 21341123423 is a prime.

It is a super-2 number, since 2×21341123431² (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 = 21341123396 and 21341123405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341123411) 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 3 ways as a sum of consecutive naturals, for example, 18646 + ... + 207436.

It is an arithmetic number, because the mean of its divisors is an integer number (5335356316).

Almost surely, 2^21341123431 is an apocalyptic number.

21341123431 is a deficient number, since it is larger than the sum of its proper divisors (301833).

21341123431 is a wasteful number, since it uses less digits than its factorization.

21341123431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301832.

The product of its digits is 1728, while the sum is 25.

Adding to 21341123431 its reverse (13432114312), we get a palindrome (34773237743).

The spelling of 21341123431 in words is "twenty-one billion, three hundred forty-one million, one hundred twenty-three thousand, four hundred thirty-one".