12921606 has 60 divisors (see below), whose sum is σ = 30278556. Its totient is φ = 4118040.

The previous prime is 12921599. The next prime is 12921611. The reversal of 12921606 is 60612921.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 12921606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 155641 + ... + 155723.

Almost surely, 2^12921606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12921606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15139278).

12921606 is an abundant number, since it is smaller than the sum of its proper divisors (17356950).

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

12921606 is an equidigital number, since it uses as much as digits as its factorization.

12921606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 12921606 is about 3594.6635447563. The cubic root of 12921606 is about 234.6598731282.

The spelling of 12921606 in words is "twelve million, nine hundred twenty-one thousand, six hundred six".