219222921 has 4 divisors (see below), whose sum is σ = 292297232. Its totient is φ = 146148612.

The previous prime is 219222889. The next prime is 219222947. The reversal of 219222921 is 129222912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 219222921 - 2⁵ = 219222889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (219222961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36537151 + ... + 36537156.

It is an arithmetic number, because the mean of its divisors is an integer number (73074308).

Almost surely, 2^219222921 is an apocalyptic number.

It is an amenable number.

219222921 is a deficient number, since it is larger than the sum of its proper divisors (73074311).

219222921 is an equidigital number, since it uses as much as digits as its factorization.

219222921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73074310.

The product of its digits is 2592, while the sum is 30.

The square root of 219222921 is about 14806.1784738669. The cubic root of 219222921 is about 602.9694656563.

Subtracting from 219222921 its reverse (129222912), we obtain a palindrome (90000009).

The spelling of 219222921 in words is "two hundred nineteen million, two hundred twenty-two thousand, nine hundred twenty-one".