21344733431 has 8 divisors (see below), whose sum is σ = 24396556800. Its totient is φ = 18293554008.

The previous prime is 21344733427. The next prime is 21344733467. The reversal of 21344733431 is 13433744312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21344733431 - 2² = 21344733427 is a prime.

It is a super-2 number, since 2×21344733431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21344733391 and 21344733400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344733481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87731 + ... + 224468.

It is an arithmetic number, because the mean of its divisors is an integer number (3049569600).

Almost surely, 2^21344733431 is an apocalyptic number.

21344733431 is a deficient number, since it is larger than the sum of its proper divisors (3051823369).

21344733431 is an equidigital number, since it uses as much as digits as its factorization.

21344733431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321973.

The product of its digits is 72576, while the sum is 35.

The spelling of 21344733431 in words is "twenty-one billion, three hundred forty-four million, seven hundred thirty-three thousand, four hundred thirty-one".