4013021 has 2 divisors, whose sum is σ = 4013022. Its totient is φ = 4013020.

The previous prime is 4012999. The next prime is 4013027. The reversal of 4013021 is 1203104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2220100 + 1792921 = 1490^2 + 1339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4013021 is a prime.

It is a super-2 number, since 2×4013021² = 32208675092882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4012993 and 4013011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4013027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2006510 + 2006511.

It is an arithmetic number, because the mean of its divisors is an integer number (2006511).

Almost surely, 2^4013021 is an apocalyptic number.

It is an amenable number.

4013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4013021 is an equidigital number, since it uses as much as digits as its factorization.

4013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 4013021 is about 2003.2526051400. The cubic root of 4013021 is about 158.9121648750.

Adding to 4013021 its reverse (1203104), we get a palindrome (5216125).

The spelling of 4013021 in words is "four million, thirteen thousand, twenty-one".