1221021222200 has 48 divisors (see below), whose sum is σ = 3057249297480. Its totient is φ = 450838604160.

The previous prime is 1221021222181. The next prime is 1221021222203. The reversal of 1221021222200 is 22221201221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221021222203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234809174 + ... + 234814373.

Almost surely, 2^{1221021222200} is an apocalyptic number.

1221021222200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221021222200 is an abundant number, since it is smaller than the sum of its proper divisors (1836228075280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221021222200 is a wasteful number, since it uses less digits than its factorization.

1221021222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469623576 (or 469623567 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221021222200 its reverse (22221201221), we get a palindrome (1243242423421).

The spelling of 1221021222200 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, two hundred".