43513421 has 12 divisors (see below), whose sum is σ = 53596188. Its totient is φ = 35102592.

The previous prime is 43513411. The next prime is 43513433. The reversal of 43513421 is 12431534.

It can be written as a sum of positive squares in 2 ways, for example, as 25755625 + 17757796 = 5075^2 + 4214^2 .

It is not a de Polignac number, because 43513421 - 2¹⁰ = 43512397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43513411) 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, 25286 + ... + 26951.

It is an arithmetic number, because the mean of its divisors is an integer number (4466349).

Almost surely, 2^43513421 is an apocalyptic number.

It is an amenable number.

43513421 is a deficient number, since it is larger than the sum of its proper divisors (10082767).

43513421 is a wasteful number, since it uses less digits than its factorization.

43513421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52268 (or 52261 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 43513421 is about 6596.4703440552. The cubic root of 43513421 is about 351.7286481598.

Adding to 43513421 its reverse (12431534), we get a palindrome (55944955).

It can be divided in two parts, 43513 and 421, that added together give a palindrome (43934).

The spelling of 43513421 in words is "forty-three million, five hundred thirteen thousand, four hundred twenty-one".