1321033401220 has 24 divisors (see below), whose sum is σ = 2987567846424. Its totient is φ = 487766178816.

The previous prime is 1321033401217. The next prime is 1321033401223. The reversal of 1321033401220 is 221043301231.

It is an interprime number because it is at equal distance from previous prime (1321033401217) and next prime (1321033401223).

It can be written as a sum of positive squares in 4 ways, for example, as 80518602564 + 1240514798656 = 283758^2 + 1113784^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1321033401191 and 1321033401200.

It is not an unprimeable number, because it can be changed into a prime (1321033401223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2540448589 + ... + 2540449108.

It is an arithmetic number, because the mean of its divisors is an integer number (124481993601).

Almost surely, 2^{1321033401220} is an apocalyptic number.

1321033401220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321033401220 is an abundant number, since it is smaller than the sum of its proper divisors (1666534445204).

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

1321033401220 is a wasteful number, since it uses less digits than its factorization.

1321033401220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080897719 (or 5080897717 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1321033401220 its reverse (221043301231), we get a palindrome (1542076702451).

The spelling of 1321033401220 in words is "one trillion, three hundred twenty-one billion, thirty-three million, four hundred one thousand, two hundred twenty".