1212110211220 has 36 divisors (see below), whose sum is σ = 2703970439100. Its totient is φ = 456323842048.

The previous prime is 1212110211217. The next prime is 1212110211229. The reversal of 1212110211220 is 221120112121.

It can be written as a sum of positive squares in 6 ways, for example, as 390817523716 + 821292687504 = 625154^2 + 906252^2 .

It is a super-2 number, since 2×1212110211220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212110211194 and 1212110211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212110211229) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 104848045 + ... + 104859604.

It is an arithmetic number, because the mean of its divisors is an integer number (75110289975).

Almost surely, 2^{1212110211220} is an apocalyptic number.

1212110211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212110211220 is an abundant number, since it is smaller than the sum of its proper divisors (1491860227880).

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

1212110211220 is a wasteful number, since it uses less digits than its factorization.

1212110211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209707692 (or 209707673 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212110211220 its reverse (221120112121), we get a palindrome (1433230323341).

Subtracting from 1212110211220 its reverse (221120112121), we obtain a palindrome (990990099099).

The spelling of 1212110211220 in words is "one trillion, two hundred twelve billion, one hundred ten million, two hundred eleven thousand, two hundred twenty".