4100721 has 4 divisors (see below), whose sum is σ = 5467632. Its totient is φ = 2733812.

The previous prime is 4100659. The next prime is 4100729. The reversal of 4100721 is 1270014.

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 4100721 - 2¹¹ = 4098673 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 4100721.

It is not an unprimeable number, because it can be changed into a prime (4100729) 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, 683451 + ... + 683456.

It is an arithmetic number, because the mean of its divisors is an integer number (1366908).

Almost surely, 2^4100721 is an apocalyptic number.

It is an amenable number.

4100721 is a deficient number, since it is larger than the sum of its proper divisors (1366911).

4100721 is a wasteful number, since it uses less digits than its factorization.

4100721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366910.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 4100721 is about 2025.0237035650. The cubic root of 4100721 is about 160.0614477522.

Adding to 4100721 its reverse (1270014), we get a palindrome (5370735).

The spelling of 4100721 in words is "four million, one hundred thousand, seven hundred twenty-one".