4029931021 has 4 divisors (see below), whose sum is σ = 4030182432. Its totient is φ = 4029679612.

The previous prime is 4029931019. The next prime is 4029931043. The reversal of 4029931021 is 1201399204.

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.

It is a cyclic number.

It is not a de Polignac number, because 4029931021 - 2¹ = 4029931019 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4029961021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99895 + ... + 134308.

It is an arithmetic number, because the mean of its divisors is an integer number (1007545608).

Almost surely, 2^4029931021 is an apocalyptic number.

It is an amenable number.

4029931021 is a deficient number, since it is larger than the sum of its proper divisors (251411).

4029931021 is a wasteful number, since it uses less digits than its factorization.

4029931021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251410.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 4029931021 is about 63481.7376967581. The cubic root of 4029931021 is about 1591.3505949853.

The spelling of 4029931021 in words is "four billion, twenty-nine million, nine hundred thirty-one thousand, twenty-one".