12520105400 has 48 divisors (see below), whose sum is σ = 31755545640. Its totient is φ = 4552764800.

The previous prime is 12520105357. The next prime is 12520105459. The reversal of 12520105400 is 450102521.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2843279 + ... + 2847678.

Almost surely, 2^12520105400 is an apocalyptic number.

12520105400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12520105400 is an abundant number, since it is smaller than the sum of its proper divisors (19235440240).

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

12520105400 is a wasteful number, since it uses less digits than its factorization.

12520105400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5690984 (or 5690975 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 12520105400 its reverse (450102521), we get a palindrome (12970207921).

The spelling of 12520105400 in words is "twelve billion, five hundred twenty million, one hundred five thousand, four hundred".