21346647345 has 24 divisors (see below), whose sum is σ = 38948270400. Its totient is φ = 10785674016.

The previous prime is 21346647341. The next prime is 21346647353. The reversal of 21346647345 is 54374664312.

21346647345 is a `hidden beast` number, since 2 + 134 + 6 + 6 + 473 + 45 = 666.

It is not a de Polignac number, because 21346647345 - 2² = 21346647341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21346647345.

It is not an unprimeable number, because it can be changed into a prime (21346647341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12482565 + ... + 12484274.

It is an arithmetic number, because the mean of its divisors is an integer number (1622844600).

Almost surely, 2^21346647345 is an apocalyptic number.

It is an amenable number.

21346647345 is a deficient number, since it is larger than the sum of its proper divisors (17601623055).

21346647345 is a wasteful number, since it uses less digits than its factorization.

21346647345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24966869 (or 24966866 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 45.

The spelling of 21346647345 in words is "twenty-one billion, three hundred forty-six million, six hundred forty-seven thousand, three hundred forty-five".