1231212221120 has 56 divisors (see below), whose sum is σ = 3350656122144. Its totient is φ = 422129903616.

The previous prime is 1231212221089. The next prime is 1231212221171. The reversal of 1231212221120 is 211222121321.

It is a tau number, because it is divible by the number of its divisors (56).

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

It is a junction number, because it is equal to n+sod(n) for n = 1231212221092 and 1231212221101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274821917 + ... + 274826396.

Almost surely, 2^{1231212221120} is an apocalyptic number.

1231212221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231212221120 is an abundant number, since it is smaller than the sum of its proper divisors (2119443901024).

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

1231212221120 is an equidigital number, since it uses as much as digits as its factorization.

1231212221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549648337 (or 549648327 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1231212221120 its reverse (211222121321), we get a palindrome (1442434342441).

The spelling of 1231212221120 in words is "one trillion, two hundred thirty-one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred twenty".