221344919 has 4 divisors (see below), whose sum is σ = 221376960. Its totient is φ = 221312880.

The previous prime is 221344891. The next prime is 221344957. The reversal of 221344919 is 919443122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221344919 is a prime.

It is a super-2 number, since 2×221344919² = 97987146334233122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221344969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 902 + ... + 21059.

It is an arithmetic number, because the mean of its divisors is an integer number (55344240).

Almost surely, 2^221344919 is an apocalyptic number.

221344919 is a deficient number, since it is larger than the sum of its proper divisors (32041).

221344919 is a wasteful number, since it uses less digits than its factorization.

221344919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32040.

The product of its digits is 15552, while the sum is 35.

The square root of 221344919 is about 14877.6651057886. The cubic root of 221344919 is about 604.9087301701.

It can be divided in two parts, 22134 and 4919, that multiplied together give a triangular number (108877146 = T₁₄₇₅₆).

The spelling of 221344919 in words is "two hundred twenty-one million, three hundred forty-four thousand, nine hundred nineteen".