1221200222212 has 6 divisors (see below), whose sum is σ = 2137100388878. Its totient is φ = 610600111104.

The previous prime is 1221200222173. The next prime is 1221200222237. The reversal of 1221200222212 is 2122220021221.

It can be written as a sum of positive squares in only one way, i.e., 1035114968836 + 186085253376 = 1017406^2 + 431376^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221200222212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152650027773 + ... + 152650027780.

Almost surely, 2^{1221200222212} is an apocalyptic number.

It is an amenable number.

1221200222212 is a deficient number, since it is larger than the sum of its proper divisors (915900166666).

1221200222212 is a wasteful number, since it uses less digits than its factorization.

1221200222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305300055557 (or 305300055555 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1221200222212 its reverse (2122220021221), we get a palindrome (3343420243433).

The spelling of 1221200222212 in words is "one trillion, two hundred twenty-one billion, two hundred million, two hundred twenty-two thousand, two hundred twelve".