501221215 has 8 divisors (see below), whose sum is σ = 656144208. Its totient is φ = 364524480.

The previous prime is 501221209. The next prime is 501221219. The reversal of 501221215 is 512122105.

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

It is not a de Polignac number, because 501221215 - 2¹¹ = 501219167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 501221192 and 501221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501221219) 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, 4556502 + ... + 4556611.

It is an arithmetic number, because the mean of its divisors is an integer number (82018026).

Almost surely, 2^501221215 is an apocalyptic number.

501221215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

501221215 is a deficient number, since it is larger than the sum of its proper divisors (154922993).

501221215 is a wasteful number, since it uses less digits than its factorization.

501221215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9113129.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 501221215 is about 22387.9703189012. The cubic root of 501221215 is about 794.3461866007.

The spelling of 501221215 in words is "five hundred one million, two hundred twenty-one thousand, two hundred fifteen".