1212211202220 has 288 divisors, whose sum is σ = 3772016539200. Its totient is φ = 315012851712.

The previous prime is 1212211202141. The next prime is 1212211202231. The reversal of 1212211202220 is 222021122121.

It is a happy number.

1212211202220 is a `hidden beast` number, since 1 + 21 + 221 + 1 + 202 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1212211202193 and 1212211202202.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 1382224422 + ... + 1382225298.

It is an arithmetic number, because the mean of its divisors is an integer number (13097279650).

Almost surely, 2^{1212211202220} is an apocalyptic number.

1212211202220 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 1212211202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1886008269600).

1212211202220 is an abundant number, since it is smaller than the sum of its proper divisors (2559805336980).

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

1212211202220 is a wasteful number, since it uses less digits than its factorization.

1212211202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937 (or 1932 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212211202220 its reverse (222021122121), we get a palindrome (1434232324341).

The spelling of 1212211202220 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred two thousand, two hundred twenty".