12899021 has 4 divisors (see below), whose sum is σ = 13459872. Its totient is φ = 12338172.

The previous prime is 12899017. The next prime is 12899077. The reversal of 12899021 is 12099821.

It is a happy number.

12899021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12099821 = 47 ⋅257443.

It is a cyclic number.

It is not a de Polignac number, because 12899021 - 2² = 12899017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12899221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280391 + ... + 280436.

It is an arithmetic number, because the mean of its divisors is an integer number (3364968).

Almost surely, 2^12899021 is an apocalyptic number.

It is an amenable number.

12899021 is a deficient number, since it is larger than the sum of its proper divisors (560851).

12899021 is an equidigital number, since it uses as much as digits as its factorization.

12899021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560850.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12899021 is about 3591.5207085579. The cubic root of 12899021 is about 234.5230768203.

The spelling of 12899021 in words is "twelve million, eight hundred ninety-nine thousand, twenty-one".