221321219 has 8 divisors (see below), whose sum is σ = 253608960. Its totient is φ = 189201096.

The previous prime is 221321209. The next prime is 221321251. The reversal of 221321219 is 912123122.

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 221321219 - 2¹² = 221317123 is a prime.

It is a super-2 number, since 2×221321219² = 97966163959291922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221321194 and 221321203.

It is not an unprimeable number, because it can be changed into a prime (221321209) 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, 39059 + ... + 44364.

It is an arithmetic number, because the mean of its divisors is an integer number (31701120).

Almost surely, 2^221321219 is an apocalyptic number.

221321219 is a deficient number, since it is larger than the sum of its proper divisors (32287741).

221321219 is an equidigital number, since it uses as much as digits as its factorization.

221321219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83809.

The product of its digits is 432, while the sum is 23.

The square root of 221321219 is about 14876.8685885169. The cubic root of 221321219 is about 604.8871396607.

It can be divided in two parts, 2213 and 21219, that added together give a palindrome (23432).

The spelling of 221321219 in words is "two hundred twenty-one million, three hundred twenty-one thousand, two hundred nineteen".