1221011001200 has 30 divisors (see below), whose sum is σ = 2933478931344. Its totient is φ = 488404400320.

The previous prime is 1221011001187. The next prime is 1221011001211. The reversal of 1221011001200 is 21001101221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1526263352 + ... + 1526264151.

Almost surely, 2^{1221011001200} is an apocalyptic number.

1221011001200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221011001200 is an abundant number, since it is smaller than the sum of its proper divisors (1712467930144).

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

1221011001200 is a wasteful number, since it uses less digits than its factorization.

1221011001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052527521 (or 3052527510 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221011001200 its reverse (21001101221), we get a palindrome (1242012102421).

The spelling of 1221011001200 in words is "one trillion, two hundred twenty-one billion, eleven million, one thousand, two hundred".