4102421 has 4 divisors (see below), whose sum is σ = 4144812. Its totient is φ = 4060032.

The previous prime is 4102409. The next prime is 4102453. The reversal of 4102421 is 1242014.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1242014 = 2 ⋅621007.

It can be written as a sum of positive squares in 2 ways, for example, as 1416100 + 2686321 = 1190^2 + 1639^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4102421 is a prime.

It is a super-2 number, since 2×4102421² = 33659716122482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4102396 and 4102405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4102471) 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, 21050 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (1036203).

Almost surely, 2^4102421 is an apocalyptic number.

It is an amenable number.

4102421 is a deficient number, since it is larger than the sum of its proper divisors (42391).

4102421 is an equidigital number, since it uses as much as digits as its factorization.

4102421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42390.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 4102421 is about 2025.4434082442. The cubic root of 4102421 is about 160.0835631208.

Adding to 4102421 its reverse (1242014), we get a palindrome (5344435).

The spelling of 4102421 in words is "four million, one hundred two thousand, four hundred twenty-one".