1221101122120 has 64 divisors (see below), whose sum is σ = 3026924043840. Its totient is φ = 439640352000.

The previous prime is 1221101122099. The next prime is 1221101122139. The reversal of 1221101122120 is 212211011221.

It is a junction number, because it is equal to n+sod(n) for n = 1221101122094 and 1221101122103.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13694322 + ... + 13783201.

It is an arithmetic number, because the mean of its divisors is an integer number (47295688185).

Almost surely, 2^{1221101122120} is an apocalyptic number.

1221101122120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221101122120 is an abundant number, since it is smaller than the sum of its proper divisors (1805822921720).

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

1221101122120 is a wasteful number, since it uses less digits than its factorization.

1221101122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27477646 (or 27477642 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221101122120 its reverse (212211011221), we get a palindrome (1433312133341).

The spelling of 1221101122120 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty-two thousand, one hundred twenty".