4200521 has 8 divisors (see below), whose sum is σ = 4598664. Its totient is φ = 3813120.

The previous prime is 4200487. The next prime is 4200523. The reversal of 4200521 is 1250024.

It can be written as a sum of positive squares in 4 ways, for example, as 18496 + 4182025 = 136^2 + 2045^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4200521 - 2²² = 6217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4200496 and 4200505.

It is not an unprimeable number, because it can be changed into a prime (4200523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1856 + ... + 3441.

It is an arithmetic number, because the mean of its divisors is an integer number (574833).

Almost surely, 2^4200521 is an apocalyptic number.

It is an amenable number.

4200521 is a deficient number, since it is larger than the sum of its proper divisors (398143).

4200521 is a wasteful number, since it uses less digits than its factorization.

4200521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5371.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 4200521 is about 2049.5172602347. The cubic root of 4200521 is about 161.3495357260.

Adding to 4200521 its reverse (1250024), we get a palindrome (5450545).

The spelling of 4200521 in words is "four million, two hundred thousand, five hundred twenty-one".