12850405821 has 36 divisors (see below), whose sum is σ = 20877080224. Its totient is φ = 7606977840.

The previous prime is 12850405807. The next prime is 12850405829.

12850405821 is a `hidden beast` number, since 1 + 28 + 50 + 4 + 0 + 582 + 1 = 666.

12850405821 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12850405821 - 2¹⁹ = 12849881533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12850405829) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90385 + ... + 184038.

Almost surely, 2^12850405821 is an apocalyptic number.

12850405821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12850405821 is a deficient number, since it is larger than the sum of its proper divisors (8026674403).

12850405821 is a wasteful number, since it uses less digits than its factorization.

12850405821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274494 (or 274480 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The spelling of 12850405821 in words is "twelve billion, eight hundred fifty million, four hundred five thousand, eight hundred twenty-one".