4202021 has 4 divisors (see below), whose sum is σ = 4423200. Its totient is φ = 3980844.

The previous prime is 4202017. The next prime is 4202027. The reversal of 4202021 is 1202024.

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 4202021 - 2² = 4202017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4201993 and 4202011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4202027) 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, 110561 + ... + 110598.

It is an arithmetic number, because the mean of its divisors is an integer number (1105800).

Almost surely, 2^4202021 is an apocalyptic number.

It is an amenable number.

4202021 is a deficient number, since it is larger than the sum of its proper divisors (221179).

4202021 is a wasteful number, since it uses less digits than its factorization.

4202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221178.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 4202021 is about 2049.8831674025. The cubic root of 4202021 is about 161.3687393360.

Adding to 4202021 its reverse (1202024), we get a palindrome (5404045).

The spelling of 4202021 in words is "four million, two hundred two thousand, twenty-one".