221646335770612 has 12 divisors (see below), whose sum is σ = 400393380747136. Its totient is φ = 107248226985720.

The previous prime is 221646335770597. The next prime is 221646335770619. The reversal of 221646335770612 is 216077533646122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221646335770619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893735224758 + ... + 893735225005.

Almost surely, 2^{221646335770612} is an apocalyptic number.

It is an amenable number.

221646335770612 is a deficient number, since it is larger than the sum of its proper divisors (178747044976524).

221646335770612 is a wasteful number, since it uses less digits than its factorization.

221646335770612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787470449798 (or 1787470449796 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 55.

The spelling of 221646335770612 in words is "two hundred twenty-one trillion, six hundred forty-six billion, three hundred thirty-five million, seven hundred seventy thousand, six hundred twelve".