6735840221 has 24 divisors (see below), whose sum is σ = 7650202560. Its totient is φ = 5922544320.

The previous prime is 6735840217. The next prime is 6735840253. The reversal of 6735840221 is 1220485376.

It is a happy number.

It is not a de Polignac number, because 6735840221 - 2² = 6735840217 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6735840721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 529625 + ... + 542193.

It is an arithmetic number, because the mean of its divisors is an integer number (318758440).

Almost surely, 2^6735840221 is an apocalyptic number.

It is an amenable number.

6735840221 is a deficient number, since it is larger than the sum of its proper divisors (914362339).

6735840221 is a wasteful number, since it uses less digits than its factorization.

6735840221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12737 (or 12726 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 6735840221 is about 82072.1647149629. The cubic root of 6735840221 is about 1888.5591531449.

The spelling of 6735840221 in words is "six billion, seven hundred thirty-five million, eight hundred forty thousand, two hundred twenty-one".