13423512421520 has 20 divisors (see below), whose sum is σ = 31209666380220. Its totient is φ = 5369404968576.

The previous prime is 13423512421513. The next prime is 13423512421531. The reversal of 13423512421520 is 2512421532431.

It can be written as a sum of positive squares in 2 ways, for example, as 8249234133904 + 5174278287616 = 2872148^2 + 2274704^2 .

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

It is a super-3 number, since 3×13423512421520³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 83896952555 + ... + 83896952714.

It is an arithmetic number, because the mean of its divisors is an integer number (1560483319011).

Almost surely, 2^{13423512421520} is an apocalyptic number.

13423512421520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13423512421520 is an abundant number, since it is smaller than the sum of its proper divisors (17786153958700).

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

13423512421520 is a wasteful number, since it uses less digits than its factorization.

13423512421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167793905282 (or 167793905276 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 13423512421520 its reverse (2512421532431), we get a palindrome (15935933953951).

The spelling of 13423512421520 in words is "thirteen trillion, four hundred twenty-three billion, five hundred twelve million, four hundred twenty-one thousand, five hundred twenty".