1221220101200 has 60 divisors (see below), whose sum is σ = 3200706876768. Its totient is φ = 444080035200.

The previous prime is 1221220101193. The next prime is 1221220101281. The reversal of 1221220101200 is 21010221221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138770612 + ... + 138779411.

Almost surely, 2^{1221220101200} is an apocalyptic number.

1221220101200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221220101200 is an abundant number, since it is smaller than the sum of its proper divisors (1979486775568).

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

1221220101200 is a wasteful number, since it uses less digits than its factorization.

1221220101200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277550052 (or 277550041 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221220101200 its reverse (21010221221), we get a palindrome (1242230322421).

The spelling of 1221220101200 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred one thousand, two hundred".