21344405743 has 32 divisors (see below), whose sum is σ = 24022241280. Its totient is φ = 18859653120.

The previous prime is 21344405741. The next prime is 21344405773. The reversal of 21344405743 is 34750444312.

It is not a de Polignac number, because 21344405743 - 2¹ = 21344405741 is a prime.

It is a super-2 number, since 2×21344405743² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344405741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6633271 + ... + 6636487.

It is an arithmetic number, because the mean of its divisors is an integer number (750695040).

Almost surely, 2^21344405743 is an apocalyptic number.

21344405743 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21344405743 is a deficient number, since it is larger than the sum of its proper divisors (2677835537).

21344405743 is a wasteful number, since it uses less digits than its factorization.

21344405743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3567.

The product of its (nonzero) digits is 161280, while the sum is 37.

The spelling of 21344405743 in words is "twenty-one billion, three hundred forty-four million, four hundred five thousand, seven hundred forty-three".