221064415 has 32 divisors (see below), whose sum is σ = 319298112. Its totient is φ = 144768000.

The previous prime is 221064407. The next prime is 221064451. The reversal of 221064415 is 514460122.

It is a happy number.

It is not a de Polignac number, because 221064415 - 2³ = 221064407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221064415.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25545 + ... + 33085.

It is an arithmetic number, because the mean of its divisors is an integer number (9978066).

Almost surely, 2^221064415 is an apocalyptic number.

221064415 is a deficient number, since it is larger than the sum of its proper divisors (98233697).

221064415 is a wasteful number, since it uses less digits than its factorization.

221064415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7611.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 221064415 is about 14868.2351003742. The cubic root of 221064415 is about 604.6530943863.

The spelling of 221064415 in words is "two hundred twenty-one million, sixty-four thousand, four hundred fifteen".