1215520535242 has 16 divisors (see below), whose sum is σ = 1977865537032. Its totient is φ = 556914516480.

The previous prime is 1215520535233. The next prime is 1215520535261. The reversal of 1215520535242 is 2425350255121.

It can be written as a sum of positive squares in 4 ways, for example, as 635545378521 + 579975156721 = 797211^2 + 761561^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170619759 + ... + 170626882.

Almost surely, 2^{1215520535242} is an apocalyptic number.

1215520535242 is a deficient number, since it is larger than the sum of its proper divisors (762345001790).

1215520535242 is a wasteful number, since it uses less digits than its factorization.

1215520535242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341246793.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 1215520535242 in words is "one trillion, two hundred fifteen billion, five hundred twenty million, five hundred thirty-five thousand, two hundred forty-two".