221965814 has 16 divisors (see below), whose sum is σ = 381356448. Its totient is φ = 94917312.

The previous prime is 221965811. The next prime is 221965853. The reversal of 221965814 is 418569122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221965811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10949 + ... + 23744.

It is an arithmetic number, because the mean of its divisors is an integer number (23834778).

Almost surely, 2^221965814 is an apocalyptic number.

221965814 is a deficient number, since it is larger than the sum of its proper divisors (159390634).

221965814 is a wasteful number, since it uses less digits than its factorization.

221965814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35159.

The product of its digits is 34560, while the sum is 38.

The square root of 221965814 is about 14898.5171745379. The cubic root of 221965814 is about 605.4738122893.

The spelling of 221965814 in words is "two hundred twenty-one million, nine hundred sixty-five thousand, eight hundred fourteen".