21101112000 has 168 divisors, whose sum is σ = 75482452032. Its totient is φ = 5626944000.

The previous prime is 21101111981. The next prime is 21101112007. The reversal of 21101112000 is 21110112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21101112007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74536 + ... + 218535.

Almost surely, 2^21101112000 is an apocalyptic number.

21101112000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101112000 is an abundant number, since it is smaller than the sum of its proper divisors (54381340032).

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

21101112000 is a wasteful number, since it uses less digits than its factorization.

21101112000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293104 (or 293081 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21101112000 its reverse (21110112), we get a palindrome (21122222112).

The spelling of 21101112000 in words is "twenty-one billion, one hundred one million, one hundred twelve thousand".