1218211030 has 32 divisors (see below), whose sum is σ = 2382658560. Its totient is φ = 446744160.

The previous prime is 1218211021. The next prime is 1218211039. The reversal of 1218211030 is 301128121.

It is an interprime number because it is at equal distance from previous prime (1218211021) and next prime (1218211039).

It is a super-2 number, since 2×1218211030² = 2968076227227321800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 1218210989 and 1218211007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218211039) 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, 97524 + ... + 109303.

It is an arithmetic number, because the mean of its divisors is an integer number (74458080).

Almost surely, 2^1218211030 is an apocalyptic number.

1218211030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218211030 is a deficient number, since it is larger than the sum of its proper divisors (1164447530).

1218211030 is a wasteful number, since it uses less digits than its factorization.

1218211030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206884.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1218211030 is about 34902.8799671317. The cubic root of 1218211030 is about 1068.0071884145.

Adding to 1218211030 its reverse (301128121), we get a palindrome (1519339151).

The spelling of 1218211030 in words is "one billion, two hundred eighteen million, two hundred eleven thousand, thirty".