43152421 has 4 divisors (see below), whose sum is σ = 46471852. Its totient is φ = 39832992.

The previous prime is 43152379. The next prime is 43152433. The reversal of 43152421 is 12425134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 22221796 = 4575^2 + 4714^2 .

It is a cyclic number.

It is not a de Polignac number, because 43152421 - 2¹³ = 43144229 is a prime.

It is a super-2 number, since 2×43152421² = 3724262876322482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43152392 and 43152401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43152481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1659696 + ... + 1659721.

It is an arithmetic number, because the mean of its divisors is an integer number (11617963).

Almost surely, 2^43152421 is an apocalyptic number.

It is an amenable number.

43152421 is a deficient number, since it is larger than the sum of its proper divisors (3319431).

43152421 is a wasteful number, since it uses less digits than its factorization.

43152421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319430.

The product of its digits is 960, while the sum is 22.

The square root of 43152421 is about 6569.0502357647. The cubic root of 43152421 is about 350.7532647467.

Adding to 43152421 its reverse (12425134), we get a palindrome (55577555).

The spelling of 43152421 in words is "forty-three million, one hundred fifty-two thousand, four hundred twenty-one".