4219021 has 4 divisors (see below), whose sum is σ = 4224352. Its totient is φ = 4213692.

The previous prime is 4219013. The next prime is 4219027. The reversal of 4219021 is 1209124.

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 4219021 - 2³ = 4219013 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 4219021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4219027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215 + ... + 3148.

It is an arithmetic number, because the mean of its divisors is an integer number (1056088).

Almost surely, 2^4219021 is an apocalyptic number.

It is an amenable number.

4219021 is a deficient number, since it is larger than the sum of its proper divisors (5331).

4219021 is an equidigital number, since it uses as much as digits as its factorization.

4219021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 4219021 is about 2054.0255597241. The cubic root of 4219021 is about 161.5860615408.

The spelling of 4219021 in words is "four million, two hundred nineteen thousand, twenty-one".