43121021 has 8 divisors (see below), whose sum is σ = 46212864. Its totient is φ = 40130640.

The previous prime is 43121011. The next prime is 43121033. The reversal of 43121021 is 12012134.

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

It is a cyclic number.

It is not a de Polignac number, because 43121021 - 2²² = 38926717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43120987 and 43121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43121011) 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, 24485 + ... + 26186.

It is an arithmetic number, because the mean of its divisors is an integer number (5776608).

Almost surely, 2^43121021 is an apocalyptic number.

It is an amenable number.

43121021 is a deficient number, since it is larger than the sum of its proper divisors (3091843).

43121021 is a wasteful number, since it uses less digits than its factorization.

43121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50731.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 43121021 is about 6566.6598054110. The cubic root of 43121021 is about 350.6681685172.

Adding to 43121021 its reverse (12012134), we get a palindrome (55133155).

The spelling of 43121021 in words is "forty-three million, one hundred twenty-one thousand, twenty-one".