1215520412320 has 24 divisors (see below), whose sum is σ = 2871666974484. Its totient is φ = 486208164864.

The previous prime is 1215520412299. The next prime is 1215520412321. The reversal of 1215520412320 is 232140255121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1069379355664 + 146141056656 = 1034108^2 + 382284^2 .

It is not an unprimeable number, because it can be changed into a prime (1215520412321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3798501129 + ... + 3798501448.

Almost surely, 2^{1215520412320} is an apocalyptic number.

1215520412320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215520412320 is an abundant number, since it is smaller than the sum of its proper divisors (1656146562164).

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

1215520412320 is an equidigital number, since it uses as much as digits as its factorization.

1215520412320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7597002592 (or 7597002584 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 1215520412320 its reverse (232140255121), we get a palindrome (1447660667441).

The spelling of 1215520412320 in words is "one trillion, two hundred fifteen billion, five hundred twenty million, four hundred twelve thousand, three hundred twenty".