12421605 has 32 divisors (see below), whose sum is σ = 22848768. Its totient is φ = 5644800.

The previous prime is 12421601. The next prime is 12421621. The reversal of 12421605 is 50612421.

It is not a de Polignac number, because 12421605 - 2² = 12421601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29295 + ... + 29715.

It is an arithmetic number, because the mean of its divisors is an integer number (714024).

Almost surely, 2^12421605 is an apocalyptic number.

12421605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12421605 is a deficient number, since it is larger than the sum of its proper divisors (10427163).

12421605 is a wasteful number, since it uses less digits than its factorization.

12421605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 12421605 is about 3524.4297411071. The cubic root of 12421605 is about 231.5932540594.

The spelling of 12421605 in words is "twelve million, four hundred twenty-one thousand, six hundred five".