221002220212 has 6 divisors (see below), whose sum is σ = 386753885378. Its totient is φ = 110501110104.

The previous prime is 221002220191. The next prime is 221002220269. The reversal of 221002220212 is 212022200122.

It can be written as a sum of positive squares in only one way, i.e., 120745130256 + 100257089956 = 347484^2 + 316634^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 27625277523 + ... + 27625277530.

Almost surely, 2^221002220212 is an apocalyptic number.

It is an amenable number.

221002220212 is a deficient number, since it is larger than the sum of its proper divisors (165751665166).

221002220212 is a wasteful number, since it uses less digits than its factorization.

221002220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55250555057 (or 55250555055 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 221002220212 its reverse (212022200122), we get a palindrome (433024420334).

The spelling of 221002220212 in words is "two hundred twenty-one billion, two million, two hundred twenty thousand, two hundred twelve".