221056543 has 12 divisors (see below), whose sum is σ = 228883320. Its totient is φ = 213475520.

The previous prime is 221056529. The next prime is 221056553. The reversal of 221056543 is 345650122.

It is not a de Polignac number, because 221056543 - 2²⁵ = 187502111 is a prime.

It is a super-2 number, since 2×221056543² = 97731990406221698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221056513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179253 + ... + 180481.

It is an arithmetic number, because the mean of its divisors is an integer number (19073610).

Almost surely, 2^221056543 is an apocalyptic number.

221056543 is a deficient number, since it is larger than the sum of its proper divisors (7826777).

221056543 is a wasteful number, since it uses less digits than its factorization.

221056543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418 (or 1377 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 221056543 is about 14867.9703725828. The cubic root of 221056543 is about 604.6459171636.

The spelling of 221056543 in words is "two hundred twenty-one million, fifty-six thousand, five hundred forty-three".