43121331 has 12 divisors (see below), whose sum is σ = 67948920. Its totient is φ = 26134080.

The previous prime is 43121329. The next prime is 43121339. The reversal of 43121331 is 13312134.

It is not a de Polignac number, because 43121331 - 2¹ = 43121329 is a prime.

It is a super-2 number, since 2×43121331² = 3718898374423122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43121339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217686 + ... + 217883.

It is an arithmetic number, because the mean of its divisors is an integer number (5662410).

Almost surely, 2^43121331 is an apocalyptic number.

43121331 is a deficient number, since it is larger than the sum of its proper divisors (24827589).

43121331 is a wasteful number, since it uses less digits than its factorization.

43121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435586 (or 435583 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 43121331 is about 6566.6834094541. The cubic root of 43121331 is about 350.6690088411.

Adding to 43121331 its reverse (13312134), we get a palindrome (56433465).

It can be divided in two parts, 4312133 and 1, that added together give a palindrome (4312134).

The spelling of 43121331 in words is "forty-three million, one hundred twenty-one thousand, three hundred thirty-one".