4072121 has 4 divisors (see below), whose sum is σ = 4141200. Its totient is φ = 4003044.

The previous prime is 4072097. The next prime is 4072139. The reversal of 4072121 is 1212704.

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 4072121 - 2¹⁰ = 4071097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4072121.

It is not an unprimeable number, because it can be changed into a prime (4072171) 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, 34451 + ... + 34568.

It is an arithmetic number, because the mean of its divisors is an integer number (1035300).

Almost surely, 2^4072121 is an apocalyptic number.

It is an amenable number.

4072121 is a deficient number, since it is larger than the sum of its proper divisors (69079).

4072121 is an equidigital number, since it uses as much as digits as its factorization.

4072121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69078.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 4072121 is about 2017.9497020491. The cubic root of 4072121 is about 159.6884693436.

Adding to 4072121 its reverse (1212704), we get a palindrome (5284825).

The spelling of 4072121 in words is "four million, seventy-two thousand, one hundred twenty-one".