1212111010220 has 192 divisors, whose sum is σ = 2959276239360. Its totient is φ = 412153958400.

The previous prime is 1212111010217. The next prime is 1212111010267. The reversal of 1212111010220 is 220101112121.

It is a junction number, because it is equal to n+sod(n) for n = 1212111010195 and 1212111010204.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 502740815 + ... + 502743225.

It is an arithmetic number, because the mean of its divisors is an integer number (15412897080).

Almost surely, 2^{1212111010220} is an apocalyptic number.

1212111010220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212111010220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1479638119680).

1212111010220 is an abundant number, since it is smaller than the sum of its proper divisors (1747165229140).

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

1212111010220 is a wasteful number, since it uses less digits than its factorization.

1212111010220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264 (or 3262 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212111010220 its reverse (220101112121), we get a palindrome (1432212122341).

The spelling of 1212111010220 in words is "one trillion, two hundred twelve billion, one hundred eleven million, ten thousand, two hundred twenty".