1101001021988 has 96 divisors (see below), whose sum is σ = 2268528864000. Its totient is φ = 467330508288.

The previous prime is 1101001021987. The next prime is 1101001022021. The reversal of 1101001021988 is 8891201001011.

It is a super-4 number, since 4×1101001021988⁴ (a number of 49 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (1101001021987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 393635006 + ... + 393637802.

It is an arithmetic number, because the mean of its divisors is an integer number (23630509000).

Almost surely, 2^{1101001021988} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1101001021988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1134264432000).

1101001021988 is an abundant number, since it is smaller than the sum of its proper divisors (1167527842012).

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

1101001021988 is a wasteful number, since it uses less digits than its factorization.

1101001021988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5474 (or 5458 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 32.

Adding to 1101001021988 its reverse (8891201001011), we get a palindrome (9992202022999).

The spelling of 1101001021988 in words is "one trillion, one hundred one billion, one million, twenty-one thousand, nine hundred eighty-eight".