221064426 has 48 divisors (see below), whose sum is σ = 527361120. Its totient is φ = 66368160.

The previous prime is 221064407. The next prime is 221064451. The reversal of 221064426 is 624460122.

221064426 is a `hidden beast` number, since 2 + 2 + 10 + 644 + 2 + 6 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221064426.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16461 + ... + 26703.

It is an arithmetic number, because the mean of its divisors is an integer number (10986690).

Almost surely, 2^221064426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221064426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263680560).

221064426 is an abundant number, since it is smaller than the sum of its proper divisors (306296694).

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

221064426 is a wasteful number, since it uses less digits than its factorization.

221064426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10371 (or 10368 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 221064426 is about 14868.2354702903. The cubic root of 221064426 is about 604.6531044154.

The spelling of 221064426 in words is "two hundred twenty-one million, sixty-four thousand, four hundred twenty-six".