15121002140240 has 80 divisors (see below), whose sum is σ = 36177440812560. Its totient is φ = 5873368227840.

The previous prime is 15121002140213. The next prime is 15121002140263. The reversal of 15121002140240 is 4204120012151.

It can be written as a sum of positive squares in 8 ways, for example, as 1818409098256 + 13302593041984 = 1348484^2 + 3647272^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3511481 + ... + 6524760.

It is an arithmetic number, because the mean of its divisors is an integer number (452218010157).

Almost surely, 2^{15121002140240} is an apocalyptic number.

15121002140240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15121002140240 is an abundant number, since it is smaller than the sum of its proper divisors (21056438672320).

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

15121002140240 is a wasteful number, since it uses less digits than its factorization.

15121002140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10036800 (or 10036794 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 15121002140240 its reverse (4204120012151), we get a palindrome (19325122152391).

The spelling of 15121002140240 in words is "fifteen trillion, one hundred twenty-one billion, two million, one hundred forty thousand, two hundred forty".