1212220118 has 8 divisors (see below), whose sum is σ = 1822258848. Its totient is φ = 604800504.

The previous prime is 1212220117. The next prime is 1212220123. The reversal of 1212220118 is 8110222121.

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

It is a super-2 number, since 2×1212220118² = 2938955228967867848, which contains 22 as substring.

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 1212220118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653621 + ... + 655472.

It is an arithmetic number, because the mean of its divisors is an integer number (227782356).

Almost surely, 2^1212220118 is an apocalyptic number.

1212220118 is a deficient number, since it is larger than the sum of its proper divisors (610038730).

1212220118 is a wasteful number, since it uses less digits than its factorization.

1212220118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309558.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1212220118 is about 34816.9515897070. The cubic root of 1212220118 is about 1066.2535638390.

Adding to 1212220118 its reverse (8110222121), we get a palindrome (9322442239).

The spelling of 1212220118 in words is "one billion, two hundred twelve million, two hundred twenty thousand, one hundred eighteen".