12899821 has 16 divisors (see below), whose sum is σ = 15069888. Its totient is φ = 10912000.

The previous prime is 12899807. The next prime is 12899827.

12899821 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-12899821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12899827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18546 + ... + 19228.

It is an arithmetic number, because the mean of its divisors is an integer number (941868).

Almost surely, 2^12899821 is an apocalyptic number.

12899821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12899821 is a deficient number, since it is larger than the sum of its proper divisors (2170067).

12899821 is a wasteful number, since it uses less digits than its factorization.

12899821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812.

The product of its digits is 20736, while the sum is 40.

The square root of 12899821 is about 3591.6320802666. The cubic root of 12899821 is about 234.5279251102.

The spelling of 12899821 in words is "twelve million, eight hundred ninety-nine thousand, eight hundred twenty-one".