21343044431 has 4 divisors (see below), whose sum is σ = 21344422392. Its totient is φ = 21341666472.

The previous prime is 21343044377. The next prime is 21343044467. The reversal of 21343044431 is 13444034312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21343044431 - 2³⁰ = 20269302607 is a prime.

It is a super-2 number, since 2×21343044431² (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 = 21343044394 and 21343044403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343044631) 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, 665480 + ... + 696813.

It is an arithmetic number, because the mean of its divisors is an integer number (5336105598).

Almost surely, 2^21343044431 is an apocalyptic number.

21343044431 is a deficient number, since it is larger than the sum of its proper divisors (1377961).

21343044431 is a wasteful number, since it uses less digits than its factorization.

21343044431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377960.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21343044431 its reverse (13444034312), we get a palindrome (34787078743).

The spelling of 21343044431 in words is "twenty-one billion, three hundred forty-three million, forty-four thousand, four hundred thirty-one".