1221133303100 has 72 divisors (see below), whose sum is σ = 2715874225008. Its totient is φ = 476296819200.

The previous prime is 1221133303099. The next prime is 1221133303121. The reversal of 1221133303100 is 13033311221.

It is a super-2 number, since 2×1221133303100² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8071754 + ... + 8221646.

Almost surely, 2^{1221133303100} is an apocalyptic number.

1221133303100 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 1221133303100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1357937112504).

1221133303100 is an abundant number, since it is smaller than the sum of its proper divisors (1494740921908).

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

1221133303100 is a wasteful number, since it uses less digits than its factorization.

1221133303100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151935 (or 151928 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 1221133303100 its reverse (13033311221), we get a palindrome (1234166614321).

The spelling of 1221133303100 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-three million, three hundred three thousand, one hundred".