12861212850 has 144 divisors (see below), whose sum is σ = 34899980544. Its totient is φ = 3395520000.

The previous prime is 12861212849. The next prime is 12861212873. The reversal of 12861212850 is 5821216821.

12861212850 is a `hidden beast` number, since 1 + 28 + 612 + 12 + 8 + 5 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 32072650 + ... + 32073050.

It is an arithmetic number, because the mean of its divisors is an integer number (242360976).

Almost surely, 2^12861212850 is an apocalyptic number.

12861212850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12861212850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17449990272).

12861212850 is an abundant number, since it is smaller than the sum of its proper divisors (22038767694).

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

12861212850 is a wasteful number, since it uses less digits than its factorization.

12861212850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 945 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The spelling of 12861212850 in words is "twelve billion, eight hundred sixty-one million, two hundred twelve thousand, eight hundred fifty".