221106646990 has 16 divisors (see below), whose sum is σ = 398000877552. Its totient is φ = 88440678144.

The previous prime is 221106646979. The next prime is 221106647077. The reversal of 221106646990 is 99646601122.

It is a self number, because there is not a number n which added to its sum of digits gives 221106646990.

It is a congruent number.

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, 273502 + ... + 719038.

It is an arithmetic number, because the mean of its divisors is an integer number (24875054847).

Almost surely, 2^221106646990 is an apocalyptic number.

221106646990 is a deficient number, since it is larger than the sum of its proper divisors (176894230562).

221106646990 is a wasteful number, since it uses less digits than its factorization.

221106646990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495171.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 221106646990 in words is "two hundred twenty-one billion, one hundred six million, six hundred forty-six thousand, nine hundred ninety".