1011221121200 has 60 divisors (see below), whose sum is σ = 2448004357128. Its totient is φ = 401400729600.

The previous prime is 1011221121199. The next prime is 1011221121221. The reversal of 1011221121200 is 21211221101.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9596657 + ... + 9701456.

Almost surely, 2^{1011221121200} is an apocalyptic number.

1011221121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011221121200 is an abundant number, since it is smaller than the sum of its proper divisors (1436783235928).

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

1011221121200 is a wasteful number, since it uses less digits than its factorization.

1011221121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19298262 (or 19298251 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1011221121200 its reverse (21211221101), we get a palindrome (1032432342301).

Subtracting from 1011221121200 its reverse (21211221101), we obtain a palindrome (990009900099).

The spelling of 1011221121200 in words is "one trillion, eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred".