221232399 has 8 divisors (see below), whose sum is σ = 304492032. Its totient is φ = 142730520.

The previous prime is 221232397. The next prime is 221232437. The reversal of 221232399 is 993232122.

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

It is not a de Polignac number, because 221232399 - 2¹ = 221232397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221232397) 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, 1189329 + ... + 1189514.

It is an arithmetic number, because the mean of its divisors is an integer number (38061504).

Almost surely, 2^221232399 is an apocalyptic number.

221232399 is a deficient number, since it is larger than the sum of its proper divisors (83259633).

221232399 is a wasteful number, since it uses less digits than its factorization.

221232399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378877.

The product of its digits is 11664, while the sum is 33.

The square root of 221232399 is about 14873.8831177336. The cubic root of 221232399 is about 604.8062116403.

The spelling of 221232399 in words is "two hundred twenty-one million, two hundred thirty-two thousand, three hundred ninety-nine".