1221031311132 has 24 divisors (see below), whose sum is σ = 2849322359296. Its totient is φ = 406974822768.

The previous prime is 1221031311091. The next prime is 1221031311161. The reversal of 1221031311132 is 2311131301221.

It is a junction number, because it is equal to n+sod(n) for n = 1221031311099 and 1221031311108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4308748 + ... + 4583379.

Almost surely, 2^{1221031311132} is an apocalyptic number.

1221031311132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221031311132 is an abundant number, since it is smaller than the sum of its proper divisors (1628291048164).

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

1221031311132 is a wasteful number, since it uses less digits than its factorization.

1221031311132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8903577 (or 8903575 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1221031311132 its reverse (2311131301221), we get a palindrome (3532162612353).

The spelling of 1221031311132 in words is "one trillion, two hundred twenty-one billion, thirty-one million, three hundred eleven thousand, one hundred thirty-two".