1868667221 has 4 divisors (see below), whose sum is σ = 1875562944. Its totient is φ = 1861771500.

The previous prime is 1868667191. The next prime is 1868667239. The reversal of 1868667221 is 1227668681.

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-1868667221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868667121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3447455 + ... + 3447996.

It is an arithmetic number, because the mean of its divisors is an integer number (468890736).

Almost surely, 2^1868667221 is an apocalyptic number.

It is an amenable number.

1868667221 is a deficient number, since it is larger than the sum of its proper divisors (6895723).

1868667221 is an equidigital number, since it uses as much as digits as its factorization.

1868667221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895722.

The product of its digits is 387072, while the sum is 47.

The square root of 1868667221 is about 43228.0837072383. The cubic root of 1868667221 is about 1231.7162067434.

The spelling of 1868667221 in words is "one billion, eight hundred sixty-eight million, six hundred sixty-seven thousand, two hundred twenty-one".