43213121 has 8 divisors (see below), whose sum is σ = 49824384. Its totient is φ = 36711360.

The previous prime is 43213109. The next prime is 43213141. The reversal of 43213121 is 12131234.

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

It is not a de Polignac number, because 43213121 - 2¹⁰ = 43212097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43213121.

It is not an unprimeable number, because it can be changed into a prime (43213141) 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, 26525 + ... + 28106.

It is an arithmetic number, because the mean of its divisors is an integer number (6228048).

Almost surely, 2^43213121 is an apocalyptic number.

It is an amenable number.

43213121 is a deficient number, since it is larger than the sum of its proper divisors (6611263).

43213121 is a wasteful number, since it uses less digits than its factorization.

43213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54751.

The product of its digits is 144, while the sum is 17.

The square root of 43213121 is about 6573.6687625709. The cubic root of 43213121 is about 350.9176490977.

Adding to 43213121 its reverse (12131234), we get a palindrome (55344355).

It can be divided in two parts, 43213 and 121, that added together give a palindrome (43334).

The spelling of 43213121 in words is "forty-three million, two hundred thirteen thousand, one hundred twenty-one".