221994215 has 8 divisors (see below), whose sum is σ = 267342768. Its totient is φ = 176962240.

The previous prime is 221994173. The next prime is 221994221. The reversal of 221994215 is 512499122.

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

It is not a de Polignac number, because 221994215 - 2¹⁴ = 221977831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77597 + ... + 80406.

It is an arithmetic number, because the mean of its divisors is an integer number (33417846).

Almost surely, 2^221994215 is an apocalyptic number.

221994215 is a deficient number, since it is larger than the sum of its proper divisors (45348553).

221994215 is a wasteful number, since it uses less digits than its factorization.

221994215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158289.

The product of its digits is 12960, while the sum is 35.

The square root of 221994215 is about 14899.4702925977. The cubic root of 221994215 is about 605.4996350772.

The spelling of 221994215 in words is "two hundred twenty-one million, nine hundred ninety-four thousand, two hundred fifteen".