43561221 has 8 divisors (see below), whose sum is σ = 63361824. Its totient is φ = 26400720.

The previous prime is 43561213. The next prime is 43561223. The reversal of 43561221 is 12216534.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43561221 - 2³ = 43561213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43561191 and 43561200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43561223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659986 + ... + 660051.

It is an arithmetic number, because the mean of its divisors is an integer number (7920228).

Almost surely, 2^43561221 is an apocalyptic number.

It is an amenable number.

43561221 is a deficient number, since it is larger than the sum of its proper divisors (19800603).

43561221 is a wasteful number, since it uses less digits than its factorization.

43561221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320051.

The product of its digits is 1440, while the sum is 24.

The square root of 43561221 is about 6600.0924993518. The cubic root of 43561221 is about 351.8573937013.

Adding to 43561221 its reverse (12216534), we get a palindrome (55777755).

The spelling of 43561221 in words is "forty-three million, five hundred sixty-one thousand, two hundred twenty-one".