1220212218 has 16 divisors (see below), whose sum is σ = 2445114816. Its totient is φ = 405955680.

The previous prime is 1220212211. The next prime is 1220212229. The reversal of 1220212218 is 8122120221.

It is a junction number, because it is equal to n+sod(n) for n = 1220212194 and 1220212203.

It is not an unprimeable number, because it can be changed into a prime (1220212211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192046 + ... + 198297.

It is an arithmetic number, because the mean of its divisors is an integer number (152819676).

Almost surely, 2^1220212218 is an apocalyptic number.

1220212218 is an abundant number, since it is smaller than the sum of its proper divisors (1224902598).

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

1220212218 is a wasteful number, since it uses less digits than its factorization.

1220212218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390869.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 1220212218 is about 34931.5361528805. The cubic root of 1220212218 is about 1068.5916831804.

Adding to 1220212218 its reverse (8122120221), we get a palindrome (9342332439).

The spelling of 1220212218 in words is "one billion, two hundred twenty million, two hundred twelve thousand, two hundred eighteen".