1321130012220 has 72 divisors (see below), whose sum is σ = 4044880358064. Its totient is φ = 349008795648.

The previous prime is 1321130012171. The next prime is 1321130012287. The reversal of 1321130012220 is 222100311231.

1321130012220 is a `hidden beast` number, since 1 + 321 + 1 + 300 + 1 + 22 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1321130012193 and 1321130012202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34277989 + ... + 34316508.

It is an arithmetic number, because the mean of its divisors is an integer number (56178893862).

Almost surely, 2^{1321130012220} is an apocalyptic number.

1321130012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321130012220 is an abundant number, since it is smaller than the sum of its proper divisors (2723750345844).

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

1321130012220 is a wasteful number, since it uses less digits than its factorization.

1321130012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68594619 (or 68594614 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1321130012220 its reverse (222100311231), we get a palindrome (1543230323451).

The spelling of 1321130012220 in words is "one trillion, three hundred twenty-one billion, one hundred thirty million, twelve thousand, two hundred twenty".