1221020000222 has 48 divisors (see below), whose sum is σ = 2125235387520. Its totient is φ = 524282132880.

The previous prime is 1221020000209. The next prime is 1221020000243. The reversal of 1221020000222 is 2220000201221.

It is a junction number, because it is equal to n+sod(n) for n = 1221020000197 and 1221020000206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1212863 + ... + 1978149.

It is an arithmetic number, because the mean of its divisors is an integer number (44275737240).

Almost surely, 2^{1221020000222} is an apocalyptic number.

1221020000222 is a deficient number, since it is larger than the sum of its proper divisors (904215387298).

1221020000222 is a wasteful number, since it uses less digits than its factorization.

1221020000222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765677 (or 765666 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 1221020000222 its reverse (2220000201221), we get a palindrome (3441020201443).

The spelling of 1221020000222 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred twenty-two", and thus it is an aban number.