13425143421520 has 20 divisors (see below), whose sum is σ = 31213458455220. Its totient is φ = 5370057368576.

The previous prime is 13425143421379. The next prime is 13425143421563. The reversal of 13425143421520 is 2512434152431.

It can be written as a sum of positive squares in 2 ways, for example, as 2800307721744 + 10624835699776 = 1673412^2 + 3259576^2 .

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

It is a super-2 number, since 2×13425143421520² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13425143421520.

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, 83907146305 + ... + 83907146464.

It is an arithmetic number, because the mean of its divisors is an integer number (1560672922761).

Almost surely, 2^{13425143421520} is an apocalyptic number.

13425143421520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13425143421520 is an abundant number, since it is smaller than the sum of its proper divisors (17788315033700).

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

13425143421520 is a wasteful number, since it uses less digits than its factorization.

13425143421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167814292782 (or 167814292776 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 13425143421520 its reverse (2512434152431), we get a palindrome (15937577573951).

The spelling of 13425143421520 in words is "thirteen trillion, four hundred twenty-five billion, one hundred forty-three million, four hundred twenty-one thousand, five hundred twenty".