6244291721 has 4 divisors (see below), whose sum is σ = 6244829952. Its totient is φ = 6243753492.

The previous prime is 6244291663. The next prime is 6244291783. The reversal of 6244291721 is 1271924426.

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 a de Polignac number, because none of the positive numbers 2^k-6244291721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6244293721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251321 + ... + 275046.

It is an arithmetic number, because the mean of its divisors is an integer number (1561207488).

Almost surely, 2^6244291721 is an apocalyptic number.

It is an amenable number.

6244291721 is a deficient number, since it is larger than the sum of its proper divisors (538231).

6244291721 is a wasteful number, since it uses less digits than its factorization.

6244291721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538230.

The product of its digits is 48384, while the sum is 38.

The square root of 6244291721 is about 79020.8309308375. The cubic root of 6244291721 is about 1841.4547923832.

The spelling of 6244291721 in words is "six billion, two hundred forty-four million, two hundred ninety-one thousand, seven hundred twenty-one".