21856846673467 has 8 divisors (see below), whose sum is σ = 23639164645824. Its totient is φ = 20088960426048.

The previous prime is 21856846673461. The next prime is 21856846673509. The reversal of 21856846673467 is 76437664865812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21856846673467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21856846673467.

It is not an unprimeable number, because it can be changed into a prime (21856846673461) 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, 3607928083 + ... + 3607934140.

It is an arithmetic number, because the mean of its divisors is an integer number (2954895580728).

Almost surely, 2^{21856846673467} is an apocalyptic number.

21856846673467 is a deficient number, since it is larger than the sum of its proper divisors (1782317972357).

21856846673467 is a wasteful number, since it uses less digits than its factorization.

21856846673467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7215862469.

The product of its digits is 1950842880, while the sum is 73.

The spelling of 21856846673467 in words is "twenty-one trillion, eight hundred fifty-six billion, eight hundred forty-six million, six hundred seventy-three thousand, four hundred sixty-seven".