1211213322220 has 48 divisors (see below), whose sum is σ = 2786293341216. Its totient is φ = 438613632000.

The previous prime is 1211213322167. The next prime is 1211213322247. The reversal of 1211213322220 is 222233121121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1211213322191 and 1211213322200.

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 15 ways as a sum of consecutive naturals, for example, 11369211 + ... + 11475250.

It is an arithmetic number, because the mean of its divisors is an integer number (58047777942).

Almost surely, 2^{1211213322220} is an apocalyptic number.

1211213322220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211213322220 is an abundant number, since it is smaller than the sum of its proper divisors (1575080018996).

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

1211213322220 is a wasteful number, since it uses less digits than its factorization.

1211213322220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22844722 (or 22844720 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1211213322220 its reverse (222233121121), we get a palindrome (1433446443341).

The spelling of 1211213322220 in words is "one trillion, two hundred eleven billion, two hundred thirteen million, three hundred twenty-two thousand, two hundred twenty".