501222221 has 8 divisors (see below), whose sum is σ = 507163800. Its totient is φ = 495305280.

The previous prime is 501222193. The next prime is 501222259. The reversal of 501222221 is 122222105.

It can be written as a sum of positive squares in 4 ways, for example, as 11485321 + 489736900 = 3389^2 + 22130^2 .

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 501222221 - 2²⁶ = 434113357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501222121) 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, 36491 + ... + 48311.

It is an arithmetic number, because the mean of its divisors is an integer number (63395475).

Almost surely, 2^501222221 is an apocalyptic number.

It is an amenable number.

501222221 is a deficient number, since it is larger than the sum of its proper divisors (5941579).

501222221 is a wasteful number, since it uses less digits than its factorization.

501222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12319.

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

The square root of 501222221 is about 22387.9927863129. The cubic root of 501222221 is about 794.3467180438.

Adding to 501222221 its reverse (122222105), we get a palindrome (623444326).

The spelling of 501222221 in words is "five hundred one million, two hundred twenty-two thousand, two hundred twenty-one".