3643242421 has 32 divisors (see below), whose sum is σ = 4694780160. Its totient is φ = 2749469184.

The previous prime is 3643242377. The next prime is 3643242439. The reversal of 3643242421 is 1242423463.

It is a de Polignac number, because none of the positive numbers 2^k-3643242421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643242521) 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, 210721 + ... + 227353.

It is an arithmetic number, because the mean of its divisors is an integer number (146711880).

Almost surely, 2^3643242421 is an apocalyptic number.

It is an amenable number.

3643242421 is a deficient number, since it is larger than the sum of its proper divisors (1051537739).

3643242421 is a wasteful number, since it uses less digits than its factorization.

3643242421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16765.

The product of its digits is 27648, while the sum is 31.

The square root of 3643242421 is about 60359.2778369655. The cubic root of 3643242421 is about 1538.7309527495.

Adding to 3643242421 its reverse (1242423463), we get a palindrome (4885665884).

The spelling of 3643242421 in words is "three billion, six hundred forty-three million, two hundred forty-two thousand, four hundred twenty-one".