12421491 has 16 divisors (see below), whose sum is σ = 17022720. Its totient is φ = 8053920.

The previous prime is 12421481. The next prime is 12421501. The reversal of 12421491 is 19412421.

It is an interprime number because it is at equal distance from previous prime (12421481) and next prime (12421501).

It is not a de Polignac number, because 12421491 - 2⁶ = 12421427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12421481) 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, 18520 + ... + 19178.

It is an arithmetic number, because the mean of its divisors is an integer number (1063920).

Almost surely, 2^12421491 is an apocalyptic number.

12421491 is a deficient number, since it is larger than the sum of its proper divisors (4601229).

12421491 is a wasteful number, since it uses less digits than its factorization.

12421491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826.

The product of its digits is 576, while the sum is 24.

The square root of 12421491 is about 3524.4135682408. The cubic root of 12421491 is about 231.5925455704.

The spelling of 12421491 in words is "twelve million, four hundred twenty-one thousand, four hundred ninety-one".