1213821218 has 8 divisors (see below), whose sum is σ = 1825486848. Its totient is φ = 605325604.

The previous prime is 1213821209. The next prime is 1213821221. The reversal of 1213821218 is 8121283121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791546 + ... + 793077.

It is an arithmetic number, because the mean of its divisors is an integer number (228185856).

Almost surely, 2^1213821218 is an apocalyptic number.

1213821218 is a deficient number, since it is larger than the sum of its proper divisors (611665630).

1213821218 is a wasteful number, since it uses less digits than its factorization.

1213821218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585008.

The product of its digits is 1536, while the sum is 29.

The square root of 1213821218 is about 34839.9371124576. The cubic root of 1213821218 is about 1066.7227931187.

The spelling of 1213821218 in words is "one billion, two hundred thirteen million, eight hundred twenty-one thousand, two hundred eighteen".