221930369 has 4 divisors (see below), whose sum is σ = 221960880. Its totient is φ = 221899860.

The previous prime is 221930363. The next prime is 221930377. The reversal of 221930369 is 963039122.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221930369 - 2¹² = 221926273 is a prime.

It is a super-2 number, since 2×221930369² = 98506177368952322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221930363) 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 3 ways as a sum of consecutive naturals, for example, 2702 + ... + 21240.

It is an arithmetic number, because the mean of its divisors is an integer number (55490220).

Almost surely, 2^221930369 is an apocalyptic number.

It is an amenable number.

221930369 is a deficient number, since it is larger than the sum of its proper divisors (30511).

221930369 is a wasteful number, since it uses less digits than its factorization.

221930369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30510.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 221930369 is about 14897.3275791331. The cubic root of 221930369 is about 605.4415818581.

It can be divided in two parts, 22 and 1930369, that added together give a palindrome (1930391).

The spelling of 221930369 in words is "two hundred twenty-one million, nine hundred thirty thousand, three hundred sixty-nine".