21110011188 has 96 divisors (see below), whose sum is σ = 59868232704. Its totient is φ = 5651547648.

The previous prime is 21110011187. The next prime is 21110011189. The reversal of 21110011188 is 88111001112.

It is an interprime number because it is at equal distance from previous prime (21110011187) and next prime (21110011189).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110011187) 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, 291595 + ... + 356717.

It is an arithmetic number, because the mean of its divisors is an integer number (623627424).

Almost surely, 2^21110011188 is an apocalyptic number.

21110011188 is a gapful number since it is divisible by the number (28) 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 21110011188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29934116352).

21110011188 is an abundant number, since it is smaller than the sum of its proper divisors (38758221516).

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

21110011188 is a wasteful number, since it uses less digits than its factorization.

21110011188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65381 (or 65379 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 24.

The spelling of 21110011188 in words is "twenty-one billion, one hundred ten million, eleven thousand, one hundred eighty-eight".