4121043221 has 4 divisors (see below), whose sum is σ = 4121172000. Its totient is φ = 4120914444.

The previous prime is 4121043191. The next prime is 4121043233. The reversal of 4121043221 is 1223401214.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4121043221 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 = 4121043193 and 4121043202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4121043271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24710 + ... + 94088.

It is an arithmetic number, because the mean of its divisors is an integer number (1030293000).

Almost surely, 2^4121043221 is an apocalyptic number.

It is an amenable number.

4121043221 is a deficient number, since it is larger than the sum of its proper divisors (128779).

4121043221 is an equidigital number, since it uses as much as digits as its factorization.

4121043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128778.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 4121043221 is about 64195.3520202203. The cubic root of 4121043221 is about 1603.2542128920.

Adding to 4121043221 its reverse (1223401214), we get a palindrome (5344444435).

The spelling of 4121043221 in words is "four billion, one hundred twenty-one million, forty-three thousand, two hundred twenty-one".