12545221400 has 48 divisors (see below), whose sum is σ = 30883391640. Its totient is φ = 4722905600.

The previous prime is 12545221379. The next prime is 12545221483. The reversal of 12545221400 is 412254521.

It is a self number, because there is not a number n which added to its sum of digits gives 12545221400.

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, 1841486 + ... + 1848285.

Almost surely, 2^12545221400 is an apocalyptic number.

12545221400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12545221400 is an abundant number, since it is smaller than the sum of its proper divisors (18338170240).

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

12545221400 is a wasteful number, since it uses less digits than its factorization.

12545221400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3689804 (or 3689795 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 12545221400 its reverse (412254521), we get a palindrome (12957475921).

The spelling of 12545221400 in words is "twelve billion, five hundred forty-five million, two hundred twenty-one thousand, four hundred".