1221132033100 has 180 divisors, whose sum is σ = 3096701189064. Its totient is φ = 417944567040.

The previous prime is 1221132033091. The next prime is 1221132033103. The reversal of 1221132033100 is 13302311221.

It is a super-2 number, since 2×1221132033100² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221132033103) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 148137579 + ... + 148145821.

Almost surely, 2^{1221132033100} is an apocalyptic number.

1221132033100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221132033100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1548350594532).

1221132033100 is an abundant number, since it is smaller than the sum of its proper divisors (1875569155964).

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

1221132033100 is an equidigital number, since it uses as much as digits as its factorization.

1221132033100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8902 (or 8874 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1221132033100 its reverse (13302311221), we get a palindrome (1234434344321).

The spelling of 1221132033100 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-two million, thirty-three thousand, one hundred".