221506201 has 8 divisors (see below), whose sum is σ = 259037504. Its totient is φ = 185446800.

The previous prime is 221506151. The next prime is 221506213. The reversal of 221506201 is 102605122.

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

It is not a de Polignac number, because 221506201 - 2¹³ = 221498009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221506301) 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, 367650 + ... + 368251.

It is an arithmetic number, because the mean of its divisors is an integer number (32379688).

Almost surely, 2^221506201 is an apocalyptic number.

It is an amenable number.

221506201 is a deficient number, since it is larger than the sum of its proper divisors (37531303).

221506201 is an equidigital number, since it uses as much as digits as its factorization.

221506201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735951.

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

The square root of 221506201 is about 14883.0843913485. The cubic root of 221506201 is about 605.0556158603.

The spelling of 221506201 in words is "two hundred twenty-one million, five hundred six thousand, two hundred one".