221409794 has 8 divisors (see below), whose sum is σ = 332904828. Its totient is φ = 110441520.

The previous prime is 221409791. The next prime is 221409817. The reversal of 221409794 is 497904122.

221409794 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 123498769 + 97911025 = 11113^2 + 9895^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221409791) 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, 130637 + ... + 132320.

Almost surely, 2^221409794 is an apocalyptic number.

221409794 is a deficient number, since it is larger than the sum of its proper divisors (111495034).

221409794 is a wasteful number, since it uses less digits than its factorization.

221409794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263380.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 221409794 is about 14879.8452276897. The cubic root of 221409794 is about 604.9678228908.

The spelling of 221409794 in words is "two hundred twenty-one million, four hundred nine thousand, seven hundred ninety-four".