221543165423456 has 24 divisors (see below), whose sum is σ = 436960480100760. Its totient is φ = 110569075239168.

The previous prime is 221543165423443. The next prime is 221543165423467. The reversal of 221543165423456 is 654324561345122.

It is a junction number, because it is equal to n+sod(n) for n = 221543165423398 and 221543165423407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6328340741 + ... + 6328375748.

It is an arithmetic number, because the mean of its divisors is an integer number (18206686670865).

Almost surely, 2^{221543165423456} is an apocalyptic number.

It is an amenable number.

221543165423456 is a deficient number, since it is larger than the sum of its proper divisors (215417314677304).

221543165423456 is a wasteful number, since it uses less digits than its factorization.

221543165423456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12656717046 (or 12656717038 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 53.

The spelling of 221543165423456 in words is "two hundred twenty-one trillion, five hundred forty-three billion, one hundred sixty-five million, four hundred twenty-three thousand, four hundred fifty-six".