4352021 has 4 divisors (see below), whose sum is σ = 4356492. Its totient is φ = 4347552.

The previous prime is 4352009. The next prime is 4352039. The reversal of 4352021 is 1202534.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1202534 = 2 ⋅601267.

It can be written as a sum of positive squares in 2 ways, for example, as 3648100 + 703921 = 1910^2 + 839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4352021 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 (4352081) 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, 86 + ... + 2951.

It is an arithmetic number, because the mean of its divisors is an integer number (1089123).

Almost surely, 2^4352021 is an apocalyptic number.

It is an amenable number.

4352021 is a deficient number, since it is larger than the sum of its proper divisors (4471).

4352021 is a wasteful number, since it uses less digits than its factorization.

4352021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4470.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 4352021 is about 2086.1498028665. The cubic root of 4352021 is about 163.2664666828.

Adding to 4352021 its reverse (1202534), we get a palindrome (5554555).

The spelling of 4352021 in words is "four million, three hundred fifty-two thousand, twenty-one".