4200421 has 4 divisors (see below), whose sum is σ = 4383072. Its totient is φ = 4017772.

The previous prime is 4200419. The next prime is 4200433. The reversal of 4200421 is 1240024.

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 4200421 - 2¹ = 4200419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4200401) 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, 91291 + ... + 91336.

It is an arithmetic number, because the mean of its divisors is an integer number (1095768).

Almost surely, 2^4200421 is an apocalyptic number.

4200421 is the 1096-th centered heptagonal number.

It is an amenable number.

4200421 is a deficient number, since it is larger than the sum of its proper divisors (182651).

4200421 is a wasteful number, since it uses less digits than its factorization.

4200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182650.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 4200421 is about 2049.4928641008. The cubic root of 4200421 is about 161.3482553228.

Adding to 4200421 its reverse (1240024), we get a palindrome (5440445).

It can be divided in two parts, 42004 and 21, that added together give a square (42025 = 205²).

The spelling of 4200421 in words is "four million, two hundred thousand, four hundred twenty-one".