201506221 has 8 divisors (see below), whose sum is σ = 230618880. Its totient is φ = 172475088.

The previous prime is 201506189. The next prime is 201506237. The reversal of 201506221 is 122605102.

201506221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 201506221 - 2⁵ = 201506189 is a prime.

It is a super-3 number, since 3×201506221³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201506281) 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, 14986 + ... + 25051.

It is an arithmetic number, because the mean of its divisors is an integer number (28827360).

Almost surely, 2^201506221 is an apocalyptic number.

It is an amenable number.

201506221 is a deficient number, since it is larger than the sum of its proper divisors (29112659).

201506221 is an equidigital number, since it uses as much as digits as its factorization.

201506221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40763.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 201506221 is about 14195.2886902662. The cubic root of 201506221 is about 586.2679498901.

The spelling of 201506221 in words is "two hundred one million, five hundred six thousand, two hundred twenty-one".