650021721 has 8 divisors (see below), whose sum is σ = 877138080. Its totient is φ = 428126592.

The previous prime is 650021693. The next prime is 650021731. The reversal of 650021721 is 127120056.

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

It is not a de Polignac number, because 650021721 - 2⁶ = 650021657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 650021691 and 650021700.

It is not an unprimeable number, because it can be changed into a prime (650021731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305016 + ... + 1305513.

It is an arithmetic number, because the mean of its divisors is an integer number (109642260).

Almost surely, 2^650021721 is an apocalyptic number.

It is an amenable number.

650021721 is a deficient number, since it is larger than the sum of its proper divisors (227116359).

650021721 is a wasteful number, since it uses less digits than its factorization.

650021721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610615.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 650021721 is about 25495.5235482623. The cubic root of 650021721 is about 866.2487542486.

Adding to 650021721 its reverse (127120056), we get a palindrome (777141777).

The spelling of 650021721 in words is "six hundred fifty million, twenty-one thousand, seven hundred twenty-one".