43312121 has 4 divisors (see below), whose sum is σ = 43379712. Its totient is φ = 43244532.

The previous prime is 43312111. The next prime is 43312123. The reversal of 43312121 is 12121334.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12121334 = 2 ⋅6060667.

It is a cyclic number.

It is not a de Polignac number, because 43312121 - 2⁶ = 43312057 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 43312121.

It is not an unprimeable number, because it can be changed into a prime (43312123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32825 + ... + 34118.

It is an arithmetic number, because the mean of its divisors is an integer number (10844928).

Almost surely, 2^43312121 is an apocalyptic number.

It is an amenable number.

43312121 is a deficient number, since it is larger than the sum of its proper divisors (67591).

43312121 is an equidigital number, since it uses as much as digits as its factorization.

43312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67590.

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

The square root of 43312121 is about 6581.1944964421. The cubic root of 43312121 is about 351.1854254126.

Adding to 43312121 its reverse (12121334), we get a palindrome (55433455).

The spelling of 43312121 in words is "forty-three million, three hundred twelve thousand, one hundred twenty-one".