21343667573 has 8 divisors (see below), whose sum is σ = 22207289400. Its totient is φ = 20488554688.

The previous prime is 21343667561. The next prime is 21343667599. The reversal of 21343667573 is 37576634312.

It can be written as a sum of positive squares in 4 ways, for example, as 5173493329 + 16170174244 = 71927^2 + 127162^2 .

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 21343667573 - 2⁴ = 21343667557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343667533) 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, 2122118 + ... + 2132151.

It is an arithmetic number, because the mean of its divisors is an integer number (2775911175).

Almost surely, 2^21343667573 is an apocalyptic number.

It is an amenable number.

21343667573 is a deficient number, since it is larger than the sum of its proper divisors (863621827).

21343667573 is a wasteful number, since it uses less digits than its factorization.

21343667573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254471.

The product of its digits is 1905120, while the sum is 47.

The spelling of 21343667573 in words is "twenty-one billion, three hundred forty-three million, six hundred sixty-seven thousand, five hundred seventy-three".