220543621 has 4 divisors (see below), whose sum is σ = 232151200. Its totient is φ = 208936044.

The previous prime is 220543607. The next prime is 220543639. The reversal of 220543621 is 126345022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220543621 - 2¹⁹ = 220019333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220543651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5803761 + ... + 5803798.

It is an arithmetic number, because the mean of its divisors is an integer number (58037800).

Almost surely, 2^220543621 is an apocalyptic number.

It is an amenable number.

220543621 is a deficient number, since it is larger than the sum of its proper divisors (11607579).

220543621 is a wasteful number, since it uses less digits than its factorization.

220543621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11607578.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 220543621 is about 14850.7111277541. The cubic root of 220543621 is about 604.1778975785.

Adding to 220543621 its reverse (126345022), we get a palindrome (346888643).

The spelling of 220543621 in words is "two hundred twenty million, five hundred forty-three thousand, six hundred twenty-one".