501450021 has 20 divisors (see below), whose sum is σ = 750343264. Its totient is φ = 333736200.

The previous prime is 501450007. The next prime is 501450121. The reversal of 501450021 is 120054105.

It is not a de Polignac number, because 501450021 - 2¹⁸ = 501187877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 501449976 and 501450003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501450121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 46206 + ... + 56016.

Almost surely, 2^501450021 is an apocalyptic number.

It is an amenable number.

501450021 is a deficient number, since it is larger than the sum of its proper divisors (248893243).

501450021 is an equidigital number, since it uses as much as digits as its factorization.

501450021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10454 (or 10445 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 501450021 is about 22393.0797569249. The cubic root of 501450021 is about 794.4670404398.

The spelling of 501450021 in words is "five hundred one million, four hundred fifty thousand, twenty-one".