221220434 has 8 divisors (see below), whose sum is σ = 331934988. Its totient is φ = 110575440.

The previous prime is 221220427. The next prime is 221220437. The reversal of 221220434 is 434022122.

It can be written as a sum of positive squares in 2 ways, for example, as 214476025 + 6744409 = 14645^2 + 2597^2 .

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 (221220437) 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, 8537 + ... + 22700.

Almost surely, 2^221220434 is an apocalyptic number.

221220434 is a deficient number, since it is larger than the sum of its proper divisors (110714554).

221220434 is a wasteful number, since it uses less digits than its factorization.

221220434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34780.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 221220434 is about 14873.4808972211. The cubic root of 221220434 is about 604.7953081186.

Adding to 221220434 its reverse (434022122), we get a palindrome (655242556).

The spelling of 221220434 in words is "two hundred twenty-one million, two hundred twenty thousand, four hundred thirty-four".