4291021 has 16 divisors (see below), whose sum is σ = 5256576. Its totient is φ = 3419136.

The previous prime is 4290997. The next prime is 4291031. The reversal of 4291021 is 1201924.

It is not a de Polignac number, because 4291021 - 2¹³ = 4282829 is a prime.

It is a super-2 number, since 2×4291021² = 36825722444882, which contains 22 as substring.

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 4291021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4291031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12565 + ... + 12901.

It is an arithmetic number, because the mean of its divisors is an integer number (328536).

Almost surely, 2^4291021 is an apocalyptic number.

It is an amenable number.

4291021 is a deficient number, since it is larger than the sum of its proper divisors (965555).

4291021 is a wasteful number, since it uses less digits than its factorization.

4291021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468.

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

The square root of 4291021 is about 2071.4779747803. The cubic root of 4291021 is about 162.5000678501.

Adding to 4291021 its reverse (1201924), we get a palindrome (5492945).

The spelling of 4291021 in words is "four million, two hundred ninety-one thousand, twenty-one".