1321011312220 has 48 divisors (see below), whose sum is σ = 2862243941760. Its totient is φ = 511872132096.

The previous prime is 1321011312199. The next prime is 1321011312251. The reversal of 1321011312220 is 222131101231.

It is a congruent number.

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, 7803837 + ... + 7971316.

It is an arithmetic number, because the mean of its divisors is an integer number (59630082120).

Almost surely, 2^{1321011312220} is an apocalyptic number.

1321011312220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321011312220 is an abundant number, since it is smaller than the sum of its proper divisors (1541232629540).

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

1321011312220 is a wasteful number, since it uses less digits than its factorization.

1321011312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15775294 (or 15775292 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1321011312220 its reverse (222131101231), we get a palindrome (1543142413451).

The spelling of 1321011312220 in words is "one trillion, three hundred twenty-one billion, eleven million, three hundred twelve thousand, two hundred twenty".