521220201 has 8 divisors (see below), whose sum is σ = 696694944. Its totient is φ = 346612800.

The previous prime is 521220197. The next prime is 521220209. The reversal of 521220201 is 102022125.

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

It is not a de Polignac number, because 521220201 - 2² = 521220197 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521220209) 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 in 7 ways as a sum of consecutive naturals, for example, 215431 + ... + 217836.

It is an arithmetic number, because the mean of its divisors is an integer number (87086868).

Almost surely, 2^521220201 is an apocalyptic number.

It is an amenable number.

521220201 is a deficient number, since it is larger than the sum of its proper divisors (175474743).

521220201 is a wasteful number, since it uses less digits than its factorization.

521220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433671.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 521220201 is about 22830.2475019436. The cubic root of 521220201 is about 804.7736467354.

Adding to 521220201 its reverse (102022125), we get a palindrome (623242326).

The spelling of 521220201 in words is "five hundred twenty-one million, two hundred twenty thousand, two hundred one".