6168724221 has 16 divisors (see below), whose sum is σ = 8974916928. Its totient is φ = 3737692800.

The previous prime is 6168724217. The next prime is 6168724231. The reversal of 6168724221 is 1224278616.

It is not a de Polignac number, because 6168724221 - 2² = 6168724217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6168724221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6168724201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126111 + ... + 168051.

It is an arithmetic number, because the mean of its divisors is an integer number (560932308).

Almost surely, 2^6168724221 is an apocalyptic number.

It is an amenable number.

6168724221 is a deficient number, since it is larger than the sum of its proper divisors (2806192707).

6168724221 is a wasteful number, since it uses less digits than its factorization.

6168724221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46412.

The product of its digits is 64512, while the sum is 39.

The square root of 6168724221 is about 78541.2262509314. The cubic root of 6168724221 is about 1833.9962853722.

The spelling of 6168724221 in words is "six billion, one hundred sixty-eight million, seven hundred twenty-four thousand, two hundred twenty-one".