4084431721 has 2 divisors, whose sum is σ = 4084431722. Its totient is φ = 4084431720.

The previous prime is 4084431719. The next prime is 4084431727. The reversal of 4084431721 is 1271344804.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3564090000 + 520341721 = 59700^2 + 22811^2 .

It is a cyclic number.

It is not a de Polignac number, because 4084431721 - 2¹ = 4084431719 is a prime.

It is a super-2 number, since 2×4084431721² = 33365164967022043682, which contains 22 as substring.

Together with 4084431719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4084431727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042215860 + 2042215861.

It is an arithmetic number, because the mean of its divisors is an integer number (2042215861).

Almost surely, 2^4084431721 is an apocalyptic number.

It is an amenable number.

4084431721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4084431721 is an equidigital number, since it uses as much as digits as its factorization.

4084431721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 4084431721 is about 63909.5589172700. The cubic root of 4084431721 is about 1598.4922933811.

The spelling of 4084431721 in words is "four billion, eighty-four million, four hundred thirty-one thousand, seven hundred twenty-one".