1211220220230 has 96 divisors (see below), whose sum is σ = 3183957504000. Its totient is φ = 319443829056.

The previous prime is 1211220220219. The next prime is 1211220220277. The reversal of 1211220220230 is 320220221121.

1211220220230 is a `hidden beast` number, since 1 + 211 + 2 + 2 + 0 + 220 + 230 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2788491 + ... + 3193449.

It is an arithmetic number, because the mean of its divisors is an integer number (33166224000).

Almost surely, 2^{1211220220230} is an apocalyptic number.

1211220220230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211220220230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591978752000).

1211220220230 is an abundant number, since it is smaller than the sum of its proper divisors (1972737283770).

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

1211220220230 is a wasteful number, since it uses less digits than its factorization.

1211220220230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405338 (or 405335 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1211220220230 its reverse (320220221121), we get a palindrome (1531440441351).

The spelling of 1211220220230 in words is "one trillion, two hundred eleven billion, two hundred twenty million, two hundred twenty thousand, two hundred thirty".