12509821050 has 24 divisors (see below), whose sum is σ = 31024356576. Its totient is φ = 3335952240.

The previous prime is 12509821007. The next prime is 12509821069. The reversal of 12509821050 is 5012890521.

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, 41699254 + ... + 41699553.

It is an arithmetic number, because the mean of its divisors is an integer number (1292681524).

Almost surely, 2^12509821050 is an apocalyptic number.

12509821050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12509821050 is an abundant number, since it is smaller than the sum of its proper divisors (18514535526).

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

12509821050 is a wasteful number, since it uses less digits than its factorization.

12509821050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83398822 (or 83398817 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 12509821050 in words is "twelve billion, five hundred nine million, eight hundred twenty-one thousand, fifty".