12600921 has 4 divisors (see below), whose sum is σ = 16801232. Its totient is φ = 8400612.

The previous prime is 12600919. The next prime is 12600923. The reversal of 12600921 is 12900621.

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.

It is an interprime number because it is at equal distance from previous prime (12600919) and next prime (12600923).

It is not a de Polignac number, because 12600921 - 2¹ = 12600919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12600923) 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, 2100151 + ... + 2100156.

It is an arithmetic number, because the mean of its divisors is an integer number (4200308).

Almost surely, 2^12600921 is an apocalyptic number.

It is an amenable number.

12600921 is a deficient number, since it is larger than the sum of its proper divisors (4200311).

12600921 is an equidigital number, since it uses as much as digits as its factorization.

12600921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200310.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 12600921 is about 3549.7775986673. Note that the first 3 decimals coincide. The cubic root of 12600921 is about 232.7023466799.

The spelling of 12600921 in words is "twelve million, six hundred thousand, nine hundred twenty-one".