221650521 has 8 divisors (see below), whose sum is σ = 296467584. Its totient is φ = 147300240.

The previous prime is 221650501. The next prime is 221650571. The reversal of 221650521 is 125056122.

It is a happy number.

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

It is not a de Polignac number, because 221650521 - 2¹⁹ = 221126233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221650491 and 221650500.

It is not an unprimeable number, because it can be changed into a prime (221650501) 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, 115585 + ... + 117486.

It is an arithmetic number, because the mean of its divisors is an integer number (37058448).

Almost surely, 2^221650521 is an apocalyptic number.

It is an amenable number.

221650521 is a deficient number, since it is larger than the sum of its proper divisors (74817063).

221650521 is a wasteful number, since it uses less digits than its factorization.

221650521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233391.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 221650521 is about 14887.9320592217. The cubic root of 221650521 is about 605.1869931738.

The spelling of 221650521 in words is "two hundred twenty-one million, six hundred fifty thousand, five hundred twenty-one".