21704670345 has 8 divisors (see below), whose sum is σ = 34727472576. Its totient is φ = 11575824176.

The previous prime is 21704670343. The next prime is 21704670347. The reversal of 21704670345 is 54307640712.

It is an interprime number because it is at equal distance from previous prime (21704670343) and next prime (21704670347).

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 21704670345 - 2¹ = 21704670343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21704670341) 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, 723488997 + ... + 723489026.

It is an arithmetic number, because the mean of its divisors is an integer number (4340934072).

Almost surely, 2^21704670345 is an apocalyptic number.

It is an amenable number.

21704670345 is a deficient number, since it is larger than the sum of its proper divisors (13022802231).

21704670345 is a wasteful number, since it uses less digits than its factorization.

21704670345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446978031.

The product of its (nonzero) digits is 141120, while the sum is 39.

The spelling of 21704670345 in words is "twenty-one billion, seven hundred four million, six hundred seventy thousand, three hundred forty-five".