1211220788688 has 120 divisors (see below), whose sum is σ = 3439925723520. Its totient is φ = 397770428160.

The previous prime is 1211220788663. The next prime is 1211220788693. The reversal of 1211220788688 is 8868870221121.

It is a happy number.

It is a super-2 number, since 2×1211220788688² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14568645 + ... + 14651547.

It is an arithmetic number, because the mean of its divisors is an integer number (28666047696).

Almost surely, 2^{1211220788688} is an apocalyptic number.

1211220788688 is a gapful number since it is divisible by the number (18) 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 1211220788688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1719962861760).

1211220788688 is an abundant number, since it is smaller than the sum of its proper divisors (2228704934832).

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

1211220788688 is a wasteful number, since it uses less digits than its factorization.

1211220788688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84417 (or 84408 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 54.

The spelling of 1211220788688 in words is "one trillion, two hundred eleven billion, two hundred twenty million, seven hundred eighty-eight thousand, six hundred eighty-eight".