221023434 has 16 divisors (see below), whose sum is σ = 445529088. Its totient is φ = 73094112.

The previous prime is 221023427. The next prime is 221023457. The reversal of 221023434 is 434320122.

It is a self number, because there is not a number n which added to its sum of digits gives 221023434.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 144267 + ... + 145790.

It is an arithmetic number, because the mean of its divisors is an integer number (27845568).

Almost surely, 2^221023434 is an apocalyptic number.

221023434 is an abundant number, since it is smaller than the sum of its proper divisors (224505654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221023434 is a wasteful number, since it uses less digits than its factorization.

221023434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290189.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221023434 is about 14866.8568971387. The cubic root of 221023434 is about 604.6157284753.

Adding to 221023434 its reverse (434320122), we get a palindrome (655343556).

The spelling of 221023434 in words is "two hundred twenty-one million, twenty-three thousand, four hundred thirty-four".