43021642 has 4 divisors (see below), whose sum is σ = 64532466. Its totient is φ = 21510820.

The previous prime is 43021619. The next prime is 43021711. The reversal of 43021642 is 24612034.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 42263001 + 758641 = 6501^2 + 871^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10755409 + ... + 10755412.

Almost surely, 2^43021642 is an apocalyptic number.

43021642 is a deficient number, since it is larger than the sum of its proper divisors (21510824).

43021642 is a wasteful number, since it uses less digits than its factorization.

43021642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21510823.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 43021642 is about 6559.0885037481. The cubic root of 43021642 is about 350.3985717938.

Adding to 43021642 its reverse (24612034), we get a palindrome (67633676).

The spelling of 43021642 in words is "forty-three million, twenty-one thousand, six hundred forty-two".