4021430143221 has 6 divisors (see below), whose sum is σ = 5808732429110. Its totient is φ = 2680953428808.

The previous prime is 4021430143201. The next prime is 4021430143243. The reversal of 4021430143221 is 1223410341204.

4021430143221 is a `hidden beast` number, since 4 + 0 + 2 + 1 + 430 + 1 + 4 + 3 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3902481720900 + 118948422321 = 1975470^2 + 344889^2 .

It is not a de Polignac number, because 4021430143221 - 2¹³ = 4021430135029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021430143201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223412785726 + ... + 223412785743.

Almost surely, 2^{4021430143221} is an apocalyptic number.

It is an amenable number.

4021430143221 is a deficient number, since it is larger than the sum of its proper divisors (1787302285889).

4021430143221 is a wasteful number, since it uses less digits than its factorization.

4021430143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446825571475 (or 446825571472 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 4021430143221 its reverse (1223410341204), we get a palindrome (5244840484425).

The spelling of 4021430143221 in words is "four trillion, twenty-one billion, four hundred thirty million, one hundred forty-three thousand, two hundred twenty-one".