21847456466685 has 48 divisors (see below), whose sum is σ = 39541348139904. Its totient is φ = 11138050256256.

The previous prime is 21847456466657. The next prime is 21847456466687. The reversal of 21847456466685 is 58666465474812.

It is not a de Polignac number, because 21847456466685 - 2⁵ = 21847456466653 is a prime.

It is a super-2 number, since 2×21847456466685² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21847456466687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5353654 + ... + 8506263.

It is an arithmetic number, because the mean of its divisors is an integer number (823778086248).

Almost surely, 2^{21847456466685} is an apocalyptic number.

It is an amenable number.

21847456466685 is a deficient number, since it is larger than the sum of its proper divisors (17693891673219).

21847456466685 is a wasteful number, since it uses less digits than its factorization.

21847456466685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13861474 (or 13861471 counting only the distinct ones).

The product of its digits is 1857945600, while the sum is 72.

The spelling of 21847456466685 in words is "twenty-one trillion, eight hundred forty-seven billion, four hundred fifty-six million, four hundred sixty-six thousand, six hundred eighty-five".