21673657434164 has 12 divisors (see below), whose sum is σ = 37928949805824. Its totient is φ = 10836814632504.

The previous prime is 21673657434131. The next prime is 21673657434167. The reversal of 21673657434164 is 46143475637612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21673657434167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435107 + ... + 6598229.

It is an arithmetic number, because the mean of its divisors is an integer number (3160745817152).

Almost surely, 2^{21673657434164} is an apocalyptic number.

It is an amenable number.

21673657434164 is a deficient number, since it is larger than the sum of its proper divisors (16255292371660).

21673657434164 is a wasteful number, since it uses less digits than its factorization.

21673657434164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042294 (or 7042292 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 59.

The spelling of 21673657434164 in words is "twenty-one trillion, six hundred seventy-three billion, six hundred fifty-seven million, four hundred thirty-four thousand, one hundred sixty-four".