11001211998 has 128 divisors (see below), whose sum is σ = 26416831488. Its totient is φ = 2988969984.

The previous prime is 11001211997. The next prime is 11001211999. The reversal of 11001211998 is 89911210011.

It is an interprime number because it is at equal distance from previous prime (11001211997) and next prime (11001211999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001211993) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 16346190 + ... + 16346862.

It is an arithmetic number, because the mean of its divisors is an integer number (206381496).

Almost surely, 2^11001211998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11001211998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13208415744).

11001211998 is an abundant number, since it is smaller than the sum of its proper divisors (15415619490).

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

11001211998 is a wasteful number, since it uses less digits than its factorization.

11001211998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946.

The product of its (nonzero) digits is 1296, while the sum is 33.

The spelling of 11001211998 in words is "eleven billion, one million, two hundred eleven thousand, nine hundred ninety-eight".