4015421 has 2 divisors, whose sum is σ = 4015422. Its totient is φ = 4015420.

The previous prime is 4015411. The next prime is 4015463. The reversal of 4015421 is 1245104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3724900 + 290521 = 1930^2 + 539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4015421 is a prime.

It is a super-2 number, since 2×4015421² = 32247211614482, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4015421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4015411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2007710 + 2007711.

It is an arithmetic number, because the mean of its divisors is an integer number (2007711).

Almost surely, 2^4015421 is an apocalyptic number.

It is an amenable number.

4015421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4015421 is an equidigital number, since it uses as much as digits as its factorization.

4015421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 4015421 is about 2003.8515414072. The cubic root of 4015421 is about 158.9438378707.

The spelling of 4015421 in words is "four million, fifteen thousand, four hundred twenty-one".