4006431221 has 8 divisors (see below), whose sum is σ = 4315793664. Its totient is φ = 3697236720.

The previous prime is 4006431211. The next prime is 4006431251. The reversal of 4006431221 is 1221346004.

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 4006431221 - 2¹⁸ = 4006169077 is a prime.

It is a super-2 number, since 2×4006431221² = 32102982257207101682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4006431211) 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, 9956 + ... + 90066.

It is an arithmetic number, because the mean of its divisors is an integer number (539474208).

Almost surely, 2^4006431221 is an apocalyptic number.

It is an amenable number.

4006431221 is a deficient number, since it is larger than the sum of its proper divisors (309362443).

4006431221 is a wasteful number, since it uses less digits than its factorization.

4006431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83971.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 4006431221 is about 63296.3760495022. The cubic root of 4006431221 is about 1588.2513403466.

Adding to 4006431221 its reverse (1221346004), we get a palindrome (5227777225).

The spelling of 4006431221 in words is "four billion, six million, four hundred thirty-one thousand, two hundred twenty-one".