4157005721 has 4 divisors (see below), whose sum is σ = 4534915344. Its totient is φ = 3779096100.

The previous prime is 4157005711. The next prime is 4157005753. The reversal of 4157005721 is 1275007514.

4157005721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-4157005721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4157005711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188954795 + ... + 188954816.

It is an arithmetic number, because the mean of its divisors is an integer number (1133728836).

Almost surely, 2^4157005721 is an apocalyptic number.

It is an amenable number.

4157005721 is a deficient number, since it is larger than the sum of its proper divisors (377909623).

4157005721 is a wasteful number, since it uses less digits than its factorization.

4157005721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377909622.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 4157005721 is about 64474.8456454143. The cubic root of 4157005721 is about 1607.9043398339.

The spelling of 4157005721 in words is "four billion, one hundred fifty-seven million, five thousand, seven hundred twenty-one".