4129723621 has 16 divisors (see below), whose sum is σ = 4318272000. Its totient is φ = 3944793600.

The previous prime is 4129723603. The next prime is 4129723679. The reversal of 4129723621 is 1263279214.

4129723621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 4129723621 - 2¹⁵ = 4129690853 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 (4129723021) 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 15 ways as a sum of consecutive naturals, for example, 2429830 + ... + 2431528.

It is an arithmetic number, because the mean of its divisors is an integer number (269892000).

Almost surely, 2^4129723621 is an apocalyptic number.

It is an amenable number.

4129723621 is a deficient number, since it is larger than the sum of its proper divisors (188548379).

4129723621 is a wasteful number, since it uses less digits than its factorization.

4129723621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700.

The product of its digits is 36288, while the sum is 37.

The square root of 4129723621 is about 64262.9257114862. The cubic root of 4129723621 is about 1604.3791002258.

The spelling of 4129723621 in words is "four billion, one hundred twenty-nine million, seven hundred twenty-three thousand, six hundred twenty-one".