221863653 has 12 divisors (see below), whose sum is σ = 349603488. Its totient is φ = 134462760.

The previous prime is 221863639. The next prime is 221863657. The reversal of 221863653 is 356368122.

It is a happy number.

221863653 is a `hidden beast` number, since 2 + 2 + 18 + 636 + 5 + 3 = 666.

It is not a de Polignac number, because 221863653 - 2¹⁶ = 221798117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221863657) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1120425 + ... + 1120622.

It is an arithmetic number, because the mean of its divisors is an integer number (29133624).

Almost surely, 2^221863653 is an apocalyptic number.

It is an amenable number.

221863653 is a deficient number, since it is larger than the sum of its proper divisors (127739835).

221863653 is a wasteful number, since it uses less digits than its factorization.

221863653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241064 (or 2241061 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 221863653 is about 14895.0882172614. The cubic root of 221863653 is about 605.3809071383.

The spelling of 221863653 in words is "two hundred twenty-one million, eight hundred sixty-three thousand, six hundred fifty-three".