1223221221100 has 18 divisors (see below), whose sum is σ = 2654390050004. Its totient is φ = 489288488400.

The previous prime is 1223221221091. The next prime is 1223221221179. The reversal of 1223221221100 is 11221223221.

It is a super-3 number, since 3×1223221221100³ (a number of 37 digits) contains 333 as substring.

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, 6116106006 + ... + 6116106205.

Almost surely, 2^{1223221221100} is an apocalyptic number.

1223221221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223221221100 is an abundant number, since it is smaller than the sum of its proper divisors (1431168828904).

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

1223221221100 is a wasteful number, since it uses less digits than its factorization.

1223221221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12232212225 (or 12232212218 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1223221221100 its reverse (11221223221), we get a palindrome (1234442444321).

The spelling of 1223221221100 in words is "one trillion, two hundred twenty-three billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred".