1220211011208 has 64 divisors (see below), whose sum is σ = 3501675509760. Its totient is φ = 347095884096.

The previous prime is 1220211011191. The next prime is 1220211011221. The reversal of 1220211011208 is 8021101120221.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 15960016 + ... + 16036287.

It is an arithmetic number, because the mean of its divisors is an integer number (54713679840).

Almost surely, 2^{1220211011208} is an apocalyptic number.

It is an amenable number.

1220211011208 is an abundant number, since it is smaller than the sum of its proper divisors (2281464498552).

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

1220211011208 is a wasteful number, since it uses less digits than its factorization.

1220211011208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31996546 (or 31996542 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 1220211011208 its reverse (8021101120221), we get a palindrome (9241312131429).

The spelling of 1220211011208 in words is "one trillion, two hundred twenty billion, two hundred eleven million, eleven thousand, two hundred eight".