221234706 has 144 divisors (see below), whose sum is σ = 629526240. Its totient is φ = 57380400.

The previous prime is 221234669. The next prime is 221234747. The reversal of 221234706 is 607432122.

221234706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 221234706.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 319821 + ... + 320511.

It is an arithmetic number, because the mean of its divisors is an integer number (4371710).

Almost surely, 2^221234706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221234706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314763120).

221234706 is an abundant number, since it is smaller than the sum of its proper divisors (408291534).

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

221234706 is a wasteful number, since it uses less digits than its factorization.

221234706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 221234706 is about 14873.9606695728. The cubic root of 221234706 is about 604.8083139289.

Adding to 221234706 its reverse (607432122), we get a palindrome (828666828).

The spelling of 221234706 in words is "two hundred twenty-one million, two hundred thirty-four thousand, seven hundred six".