1221101112200 has 24 divisors (see below), whose sum is σ = 2839060086330. Its totient is φ = 488440444800.

The previous prime is 1221101112151. The next prime is 1221101112211. The reversal of 1221101112200 is 22111011221.

It can be written as a sum of positive squares in 3 ways, for example, as 707479489924 + 513621622276 = 841118^2 + 716674^2 .

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, 3052752581 + ... + 3052752980.

Almost surely, 2^{1221101112200} is an apocalyptic number.

1221101112200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221101112200 is an abundant number, since it is smaller than the sum of its proper divisors (1617958974130).

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

1221101112200 is a wasteful number, since it uses less digits than its factorization.

1221101112200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6105505577 (or 6105505568 counting only the distinct ones).

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

Adding to 1221101112200 its reverse (22111011221), we get a palindrome (1243212123421).

The spelling of 1221101112200 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred twelve thousand, two hundred".