501221730 has 16 divisors (see below), whose sum is σ = 1202932224. Its totient is φ = 133659120.

The previous prime is 501221719. The next prime is 501221753. The reversal of 501221730 is 37122105.

It is a junction number, because it is equal to n+sod(n) for n = 501221697 and 501221706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8353666 + ... + 8353725.

It is an arithmetic number, because the mean of its divisors is an integer number (75183264).

Almost surely, 2^501221730 is an apocalyptic number.

501221730 is an abundant number, since it is smaller than the sum of its proper divisors (701710494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

501221730 is a wasteful number, since it uses less digits than its factorization.

501221730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16707401.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 501221730 is about 22387.9818206108. The cubic root of 501221730 is about 794.3464586616.

Adding to 501221730 its reverse (37122105), we get a palindrome (538343835).

The spelling of 501221730 in words is "five hundred one million, two hundred twenty-one thousand, seven hundred thirty".