21743398073 has 4 divisors (see below), whose sum is σ = 22018631040. Its totient is φ = 21468165108.

The previous prime is 21743398031. The next prime is 21743398081. The reversal of 21743398073 is 37089334712.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21743398073 - 2⁶ = 21743398009 is a prime.

It is a super-2 number, since 2×21743398073² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21743394073) 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, 137616365 + ... + 137616522.

It is an arithmetic number, because the mean of its divisors is an integer number (5504657760).

Almost surely, 2^21743398073 is an apocalyptic number.

It is an amenable number.

21743398073 is a deficient number, since it is larger than the sum of its proper divisors (275232967).

21743398073 is an equidigital number, since it uses as much as digits as its factorization.

21743398073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275232966.

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 21743398073 in words is "twenty-one billion, seven hundred forty-three million, three hundred ninety-eight thousand, seventy-three".