4321421 has 4 divisors (see below), whose sum is σ = 4653852. Its totient is φ = 3988992.

The previous prime is 4321411. The next prime is 4321439. The reversal of 4321421 is 1241234.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1562500 + 2758921 = 1250^2 + 1661^2 .

It is a cyclic number.

It is not a de Polignac number, because 4321421 - 2⁶ = 4321357 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 4321421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4321411) 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, 166196 + ... + 166221.

It is an arithmetic number, because the mean of its divisors is an integer number (1163463).

Almost surely, 2^4321421 is an apocalyptic number.

It is an amenable number.

4321421 is a deficient number, since it is larger than the sum of its proper divisors (332431).

4321421 is a wasteful number, since it uses less digits than its factorization.

4321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332430.

The product of its digits is 192, while the sum is 17.

The square root of 4321421 is about 2078.8027804484. The cubic root of 4321421 is about 162.8829123873.

Adding to 4321421 its reverse (1241234), we get a palindrome (5562655).

The spelling of 4321421 in words is "four million, three hundred twenty-one thousand, four hundred twenty-one".