221426768 has 20 divisors (see below), whose sum is σ = 454251060. Its totient is φ = 104200704.

The previous prime is 221426743. The next prime is 221426789. The reversal of 221426768 is 867624122.

It can be written as a sum of positive squares in 2 ways, for example, as 111344704 + 110082064 = 10552^2 + 10492^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406763 + ... + 407306.

It is an arithmetic number, because the mean of its divisors is an integer number (22712553).

Almost surely, 2^221426768 is an apocalyptic number.

It is an amenable number.

221426768 is an abundant number, since it is smaller than the sum of its proper divisors (232824292).

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

221426768 is a wasteful number, since it uses less digits than its factorization.

221426768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814094 (or 814088 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 221426768 is about 14880.4155855944. The cubic root of 221426768 is about 604.9832821007.

It can be divided in two parts, 2214 and 26768, that added together give a palindrome (28982).

The spelling of 221426768 in words is "two hundred twenty-one million, four hundred twenty-six thousand, seven hundred sixty-eight".