21344700473 has 4 divisors (see below), whose sum is σ = 21663278160. Its totient is φ = 21026122788.

The previous prime is 21344700463. The next prime is 21344700589. The reversal of 21344700473 is 37400744312.

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 21344700473 - 2⁴ = 21344700457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344700463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159288743 + ... + 159288876.

It is an arithmetic number, because the mean of its divisors is an integer number (5415819540).

Almost surely, 2^21344700473 is an apocalyptic number.

It is an amenable number.

21344700473 is a deficient number, since it is larger than the sum of its proper divisors (318577687).

21344700473 is an equidigital number, since it uses as much as digits as its factorization.

21344700473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318577686.

The product of its (nonzero) digits is 56448, while the sum is 35.

The spelling of 21344700473 in words is "twenty-one billion, three hundred forty-four million, seven hundred thousand, four hundred seventy-three".