4202521 has 2 divisors, whose sum is σ = 4202522. Its totient is φ = 4202520.

The previous prime is 4202501. The next prime is 4202567. The reversal of 4202521 is 1252024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2143296 + 2059225 = 1464^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 4202521 - 2⁵ = 4202489 is a prime.

It is a super-2 number, since 2×4202521² = 35322365510882, which contains 22 as substring.

4202521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4202495 and 4202504.

It is not a weakly prime, because it can be changed into another prime (4202501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2101260 + 2101261.

It is an arithmetic number, because the mean of its divisors is an integer number (2101261).

Almost surely, 2^4202521 is an apocalyptic number.

It is an amenable number.

4202521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4202521 is an equidigital number, since it uses as much as digits as its factorization.

4202521 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 16.

The square root of 4202521 is about 2050.0051219448. The cubic root of 4202521 is about 161.3751395237.

Adding to 4202521 its reverse (1252024), we get a palindrome (5454545).

The spelling of 4202521 in words is "four million, two hundred two thousand, five hundred twenty-one".