221004234 has 32 divisors (see below), whose sum is σ = 535769280. Its totient is φ = 66970800.

The previous prime is 221004229. The next prime is 221004241. The reversal of 221004234 is 432400122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185437 + ... + 186624.

It is an arithmetic number, because the mean of its divisors is an integer number (16742790).

Almost surely, 2^221004234 is an apocalyptic number.

221004234 is an abundant number, since it is smaller than the sum of its proper divisors (314765046).

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

221004234 is a wasteful number, since it uses less digits than its factorization.

221004234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372083 (or 372077 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 221004234 is about 14866.2111514669. The cubic root of 221004234 is about 604.5982205910.

Adding to 221004234 its reverse (432400122), we get a palindrome (653404356).

The spelling of 221004234 in words is "two hundred twenty-one million, four thousand, two hundred thirty-four".