43021121 has 32 divisors (see below), whose sum is σ = 53319168. Its totient is φ = 34179840.

The previous prime is 43021103. The next prime is 43021129. The reversal of 43021121 is 12112034.

It is a cyclic number.

It is not a de Polignac number, because 43021121 - 2¹⁴ = 43004737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43021096 and 43021105.

It is not an unprimeable number, because it can be changed into a prime (43021129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248591 + ... + 248763.

It is an arithmetic number, because the mean of its divisors is an integer number (1666224).

Almost surely, 2^43021121 is an apocalyptic number.

It is an amenable number.

43021121 is a deficient number, since it is larger than the sum of its proper divisors (10298047).

43021121 is a wasteful number, since it uses less digits than its factorization.

43021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281.

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

The square root of 43021121 is about 6559.0487877435. The cubic root of 43021121 is about 350.3971573244.

Adding to 43021121 its reverse (12112034), we get a palindrome (55133155).

The spelling of 43021121 in words is "forty-three million, twenty-one thousand, one hundred twenty-one".