221321234 has 16 divisors (see below), whose sum is σ = 354674400. Its totient is φ = 103270464.

The previous prime is 221321209. The next prime is 221321251. The reversal of 221321234 is 432123122.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40919 + ... + 46010.

It is an arithmetic number, because the mean of its divisors is an integer number (22167150).

Almost surely, 2^221321234 is an apocalyptic number.

221321234 is a deficient number, since it is larger than the sum of its proper divisors (133353166).

221321234 is a wasteful number, since it uses less digits than its factorization.

221321234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87017.

The product of its digits is 576, while the sum is 20.

The square root of 221321234 is about 14876.8690926552. The cubic root of 221321234 is about 604.8871533261.

Adding to 221321234 its reverse (432123122), we get a palindrome (653444356).

The spelling of 221321234 in words is "two hundred twenty-one million, three hundred twenty-one thousand, two hundred thirty-four".