1321243132240 has 20 divisors (see below), whose sum is σ = 3071890282644. Its totient is φ = 528497252864.

The previous prime is 1321243132211. The next prime is 1321243132303. The reversal of 1321243132240 is 422313421231.

It can be written as a sum of positive squares in 2 ways, for example, as 706198206736 + 615044925504 = 840356^2 + 784248^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1321243132240² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321243132199 and 1321243132208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8257769497 + ... + 8257769656.

Almost surely, 2^{1321243132240} is an apocalyptic number.

1321243132240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321243132240 is an abundant number, since it is smaller than the sum of its proper divisors (1750647150404).

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

1321243132240 is a wasteful number, since it uses less digits than its factorization.

1321243132240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16515539166 (or 16515539160 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1321243132240 its reverse (422313421231), we get a palindrome (1743556553471).

The spelling of 1321243132240 in words is "one trillion, three hundred twenty-one billion, two hundred forty-three million, one hundred thirty-two thousand, two hundred forty".