12443421520 has 40 divisors (see below), whose sum is σ = 28948620384. Its totient is φ = 4974329472.

The previous prime is 12443421511. The next prime is 12443421527. The reversal of 12443421520 is 2512434421.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×12443421520² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12443421527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86707 + ... + 180013.

Almost surely, 2^12443421520 is an apocalyptic number.

12443421520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12443421520 is an abundant number, since it is smaller than the sum of its proper divisors (16505198864).

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

12443421520 is a wasteful number, since it uses less digits than its factorization.

12443421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94987 (or 94981 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 12443421520 its reverse (2512434421), we get a palindrome (14955855941).

The spelling of 12443421520 in words is "twelve billion, four hundred forty-three million, four hundred twenty-one thousand, five hundred twenty".