221869387 has 8 divisors (see below), whose sum is σ = 229542272. Its totient is φ = 214228800.

The previous prime is 221869369. The next prime is 221869393. The reversal of 221869387 is 783968122.

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 221869387 - 2⁷ = 221869259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221869787) 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, 6337 + ... + 21997.

It is an arithmetic number, because the mean of its divisors is an integer number (28692784).

Almost surely, 2^221869387 is an apocalyptic number.

221869387 is a deficient number, since it is larger than the sum of its proper divisors (7672885).

221869387 is a wasteful number, since it uses less digits than its factorization.

221869387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16149.

The product of its digits is 290304, while the sum is 46.

The square root of 221869387 is about 14895.2806955760. The cubic root of 221869387 is about 605.3861223898.

The spelling of 221869387 in words is "two hundred twenty-one million, eight hundred sixty-nine thousand, three hundred eighty-seven".