215221201 has 8 divisors (see below), whose sum is σ = 234711680. Its totient is φ = 196150032.

The previous prime is 215221199. The next prime is 215221211. The reversal of 215221201 is 102122512.

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 215221201 - 2¹ = 215221199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215221211) 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, 103755 + ... + 105808.

It is an arithmetic number, because the mean of its divisors is an integer number (29338960).

Almost surely, 2^215221201 is an apocalyptic number.

It is an amenable number.

215221201 is a deficient number, since it is larger than the sum of its proper divisors (19490479).

215221201 is a wasteful number, since it uses less digits than its factorization.

215221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209655.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 215221201 is about 14670.4192509962. The cubic root of 215221201 is about 599.2780214081.

Adding to 215221201 its reverse (102122512), we get a palindrome (317343713).

The spelling of 215221201 in words is "two hundred fifteen million, two hundred twenty-one thousand, two hundred one".