2421663 has 4 divisors (see below), whose sum is σ = 3228888. Its totient is φ = 1614440.

The previous prime is 2421659. The next prime is 2421673. The reversal of 2421663 is 3661242.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2421663 - 2² = 2421659 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421673) 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, 403608 + ... + 403613.

It is an arithmetic number, because the mean of its divisors is an integer number (807222).

2^2421663 is an apocalyptic number.

2421663 is a deficient number, since it is larger than the sum of its proper divisors (807225).

2421663 is an equidigital number, since it uses as much as digits as its factorization.

2421663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807224.

The product of its digits is 1728, while the sum is 24.

The square root of 2421663 is about 1556.1693352589. The cubic root of 2421663 is about 134.2882153170.

The spelling of 2421663 in words is "two million, four hundred twenty-one thousand, six hundred sixty-three".