221121219 has 16 divisors (see below), whose sum is σ = 324820224. Its totient is φ = 132684000.

The previous prime is 221121217. The next prime is 221121223. The reversal of 221121219 is 912121122.

It is not a de Polignac number, because 221121219 - 2¹ = 221121217 is a prime.

It is a super-2 number, since 2×221121219² = 97789186984091922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221121195 and 221121204.

It is not an unprimeable number, because it can be changed into a prime (221121217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29839 + ... + 36504.

It is an arithmetic number, because the mean of its divisors is an integer number (20301264).

Almost surely, 2^221121219 is an apocalyptic number.

221121219 is a deficient number, since it is larger than the sum of its proper divisors (103699005).

221121219 is a wasteful number, since it uses less digits than its factorization.

221121219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66458.

The product of its digits is 144, while the sum is 21.

The square root of 221121219 is about 14870.1452245767. The cubic root of 221121219 is about 604.7048798549.

The spelling of 221121219 in words is "two hundred twenty-one million, one hundred twenty-one thousand, two hundred nineteen".