22161219 has 4 divisors (see below), whose sum is σ = 29548296. Its totient is φ = 14774144.

The previous prime is 22161199. The next prime is 22161229. The reversal of 22161219 is 91216122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22161219 - 2¹² = 22157123 is a prime.

It is a super-2 number, since 2×22161219² = 982239255131922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22161229) 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, 3693534 + ... + 3693539.

It is an arithmetic number, because the mean of its divisors is an integer number (7387074).

Almost surely, 2^22161219 is an apocalyptic number.

22161219 is a deficient number, since it is larger than the sum of its proper divisors (7387077).

22161219 is an equidigital number, since it uses as much as digits as its factorization.

22161219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7387076.

The product of its digits is 432, while the sum is 24.

The square root of 22161219 is about 4707.5703924636. The cubic root of 22161219 is about 280.8867254502.

The spelling of 22161219 in words is "twenty-two million, one hundred sixty-one thousand, two hundred nineteen".