6453243221 has 4 divisors (see below), whose sum is σ = 6549560352. Its totient is φ = 6356926092.

The previous prime is 6453243191. The next prime is 6453243281. The reversal of 6453243221 is 1223423546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6453243221 - 2⁶ = 6453243157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6453243281) 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, 48158465 + ... + 48158598.

It is an arithmetic number, because the mean of its divisors is an integer number (1637390088).

Almost surely, 2^6453243221 is an apocalyptic number.

It is an amenable number.

6453243221 is a deficient number, since it is larger than the sum of its proper divisors (96317131).

6453243221 is an equidigital number, since it uses as much as digits as its factorization.

6453243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96317130.

The product of its digits is 34560, while the sum is 32.

The square root of 6453243221 is about 80332.0808954928. The cubic root of 6453243221 is about 1861.7699286317.

Adding to 6453243221 its reverse (1223423546), we get a palindrome (7676666767).

The spelling of 6453243221 in words is "six billion, four hundred fifty-three million, two hundred forty-three thousand, two hundred twenty-one".