12421599 has 16 divisors (see below), whose sum is σ = 17397120. Its totient is φ = 7872480.

The previous prime is 12421597. The next prime is 12421601. The reversal of 12421599 is 99512421.

It is an interprime number because it is at equal distance from previous prime (12421597) and next prime (12421601).

It is not a de Polignac number, because 12421599 - 2¹ = 12421597 is a prime.

It is a super-2 number, since 2×12421599² = 308592243433602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421597) 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, 4764 + ... + 6894.

It is an arithmetic number, because the mean of its divisors is an integer number (1087320).

Almost surely, 2^12421599 is an apocalyptic number.

12421599 is a deficient number, since it is larger than the sum of its proper divisors (4975521).

12421599 is a wasteful number, since it uses less digits than its factorization.

12421599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230.

The product of its digits is 6480, while the sum is 33.

The square root of 12421599 is about 3524.4288899054. The cubic root of 12421599 is about 231.5932167706.

The spelling of 12421599 in words is "twelve million, four hundred twenty-one thousand, five hundred ninety-nine".