221995012618 has 16 divisors (see below), whose sum is σ = 354407165640. Its totient is φ = 103926951936.

The previous prime is 221995012597. The next prime is 221995012621. The reversal of 221995012618 is 816210599122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 137623934529 + 84371078089 = 370977^2 + 290467^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16908633 + ... + 16921756.

Almost surely, 2^221995012618 is an apocalyptic number.

221995012618 is a deficient number, since it is larger than the sum of its proper divisors (132412153022).

221995012618 is a wasteful number, since it uses less digits than its factorization.

221995012618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33830601.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 221995012618 in words is "two hundred twenty-one billion, nine hundred ninety-five million, twelve thousand, six hundred eighteen".