1220012211100 has 36 divisors (see below), whose sum is σ = 2657492815824. Its totient is φ = 486149342080.

The previous prime is 1220012211083. The next prime is 1220012211107. The reversal of 1220012211100 is 11122100221.

It is a super-2 number, since 2×1220012211100² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220012211107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23167849 + ... + 23220448.

It is an arithmetic number, because the mean of its divisors is an integer number (73819244884).

Almost surely, 2^{1220012211100} is an apocalyptic number.

1220012211100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220012211100 is an abundant number, since it is smaller than the sum of its proper divisors (1437480604724).

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

1220012211100 is a wasteful number, since it uses less digits than its factorization.

1220012211100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46388574 (or 46388567 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1220012211100 its reverse (11122100221), we get a palindrome (1231134311321).

The spelling of 1220012211100 in words is "one trillion, two hundred twenty billion, twelve million, two hundred eleven thousand, one hundred".