1215142044520 has 64 divisors (see below), whose sum is σ = 2754398552400. Its totient is φ = 482443745280.

The previous prime is 1215142044509. The next prime is 1215142044521. The reversal of 1215142044520 is 254402415121.

It can be written as a sum of positive squares in 8 ways, for example, as 187355659716 + 1027786384804 = 432846^2 + 1013798^2 .

It is not an unprimeable number, because it can be changed into a prime (1215142044521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72924990 + ... + 72941650.

Almost surely, 2^{1215142044520} is an apocalyptic number.

1215142044520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215142044520 is an abundant number, since it is smaller than the sum of its proper divisors (1539256507880).

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

1215142044520 is a wasteful number, since it uses less digits than its factorization.

1215142044520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30118 (or 30114 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 1215142044520 its reverse (254402415121), we get a palindrome (1469544459641).

The spelling of 1215142044520 in words is "one trillion, two hundred fifteen billion, one hundred forty-two million, forty-four thousand, five hundred twenty".