1212212118 has 32 divisors (see below), whose sum is σ = 2612881152. Its totient is φ = 372708000.

The previous prime is 1212212101. The next prime is 1212212119. The reversal of 1212212118 is 8112122121.

It is a junction number, because it is equal to n+sod(n) for n = 1212212094 and 1212212103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212212119) 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, 114343 + ... + 124493.

It is an arithmetic number, because the mean of its divisors is an integer number (81652536).

Almost surely, 2^1212212118 is an apocalyptic number.

1212212118 is an abundant number, since it is smaller than the sum of its proper divisors (1400669034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212212118 is a wasteful number, since it uses less digits than its factorization.

1212212118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11700.

The product of its digits is 128, while the sum is 21.

The square root of 1212212118 is about 34816.8367029516. The cubic root of 1212212118 is about 1066.2512182674.

Adding to 1212212118 its reverse (8112122121), we get a palindrome (9324334239).

The spelling of 1212212118 in words is "one billion, two hundred twelve million, two hundred twelve thousand, one hundred eighteen".