4202421 has 4 divisors (see below), whose sum is σ = 5603232. Its totient is φ = 2801612.

The previous prime is 4202413. The next prime is 4202447. The reversal of 4202421 is 1242024.

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 4202421 - 2³ = 4202413 is a prime.

It is a super-2 number, since 2×4202421² = 35320684522482, which contains 22 as substring.

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 4202421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4202461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700401 + ... + 700406.

It is an arithmetic number, because the mean of its divisors is an integer number (1400808).

Almost surely, 2^4202421 is an apocalyptic number.

It is an amenable number.

4202421 is a deficient number, since it is larger than the sum of its proper divisors (1400811).

4202421 is a wasteful number, since it uses less digits than its factorization.

4202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400810.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 4202421 is about 2049.9807316168. The cubic root of 4202421 is about 161.3738595267.

Adding to 4202421 its reverse (1242024), we get a palindrome (5444445).

The spelling of 4202421 in words is "four million, two hundred two thousand, four hundred twenty-one".