21112012000 has 96 divisors (see below), whose sum is σ = 51972429600. Its totient is φ = 8428492800.

The previous prime is 21112011917. The next prime is 21112012049. The reversal of 21112012000 is 21021112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2183176 + ... + 2192824.

It is an arithmetic number, because the mean of its divisors is an integer number (541379475).

Almost surely, 2^21112012000 is an apocalyptic number.

21112012000 is a gapful number since it is divisible by the number (20) 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 21112012000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25986214800).

21112012000 is an abundant number, since it is smaller than the sum of its proper divisors (30860417600).

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

21112012000 is an equidigital number, since it uses as much as digits as its factorization.

21112012000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10221 (or 10203 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21112012000 its reverse (21021112), we get a palindrome (21133033112).

The spelling of 21112012000 in words is "twenty-one billion, one hundred twelve million, twelve thousand".