4021432221 has 8 divisors (see below), whose sum is σ = 5368169664. Its totient is φ = 2677824800.

The previous prime is 4021432147. The next prime is 4021432231. The reversal of 4021432221 is 1222341204.

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 4021432221 - 2¹⁴ = 4021415837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021432231) 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, 779505 + ... + 784646.

It is an arithmetic number, because the mean of its divisors is an integer number (671021208).

Almost surely, 2^4021432221 is an apocalyptic number.

It is an amenable number.

4021432221 is a deficient number, since it is larger than the sum of its proper divisors (1346737443).

4021432221 is a wasteful number, since it uses less digits than its factorization.

4021432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565011.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 4021432221 is about 63414.7634309236. The cubic root of 4021432221 is about 1590.2311309108.

Adding to 4021432221 its reverse (1222341204), we get a palindrome (5243773425).

The spelling of 4021432221 in words is "four billion, twenty-one million, four hundred thirty-two thousand, two hundred twenty-one".