221400543 has 32 divisors (see below), whose sum is σ = 375058432. Its totient is φ = 113011200.

The previous prime is 221400527. The next prime is 221400601. The reversal of 221400543 is 345004122.

It is not a de Polignac number, because 221400543 - 2⁴ = 221400527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221400043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4618 + ... + 21543.

It is an arithmetic number, because the mean of its divisors is an integer number (11720576).

Almost surely, 2^221400543 is an apocalyptic number.

221400543 is a deficient number, since it is larger than the sum of its proper divisors (153657889).

221400543 is a wasteful number, since it uses less digits than its factorization.

221400543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26215.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221400543 is about 14879.5343677146. The cubic root of 221400543 is about 604.9593971340.

Adding to 221400543 its reverse (345004122), we get a palindrome (566404665).

The spelling of 221400543 in words is "two hundred twenty-one million, four hundred thousand, five hundred forty-three".