43013021 has 8 divisors (see below), whose sum is σ = 43540224. Its totient is φ = 42489360.

The previous prime is 43012973. The next prime is 43013041. The reversal of 43013021 is 12031034.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43013021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43012987 and 43013005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43013041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29516 + ... + 30938.

It is an arithmetic number, because the mean of its divisors is an integer number (5442528).

Almost surely, 2^43013021 is an apocalyptic number.

It is an amenable number.

43013021 is a deficient number, since it is larger than the sum of its proper divisors (527203).

43013021 is a wasteful number, since it uses less digits than its factorization.

43013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 43013021 is about 6558.4312910939. The cubic root of 43013021 is about 350.3751650638.

Adding to 43013021 its reverse (12031034), we get a palindrome (55044055).

The spelling of 43013021 in words is "forty-three million, thirteen thousand, twenty-one".