4218821999 has 8 divisors (see below), whose sum is σ = 4826642208. Its totient is φ = 3612284640.

The previous prime is 4218821927. The next prime is 4218822043. The reversal of 4218821999 is 9991288124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4218821999 - 2⁸ = 4218821743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4218821999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4218826999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313652 + ... + 326825.

It is an arithmetic number, because the mean of its divisors is an integer number (603330276).

Almost surely, 2^4218821999 is an apocalyptic number.

4218821999 is a deficient number, since it is larger than the sum of its proper divisors (607820209).

4218821999 is an equidigital number, since it uses as much as digits as its factorization.

4218821999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641425.

The product of its digits is 746496, while the sum is 53.

The square root of 4218821999 is about 64952.4595300286. The cubic root of 4218821999 is about 1615.8352095986.

The spelling of 4218821999 in words is "four billion, two hundred eighteen million, eight hundred twenty-one thousand, nine hundred ninety-nine".