21111010000 has 200 divisors, whose sum is σ = 53690313600. Its totient is φ = 8023488000.

The previous prime is 21111009943. The next prime is 21111010009. The reversal of 21111010000 is 1011112.

It is a tau number, because it is divible by the number of its divisors (200).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111010009) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 60489826 + ... + 60490174.

It is an arithmetic number, because the mean of its divisors is an integer number (268451568).

Almost surely, 2^21111010000 is an apocalyptic number.

21111010000 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 21111010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26845156800).

21111010000 is an abundant number, since it is smaller than the sum of its proper divisors (32579303600).

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

21111010000 is a wasteful number, since it uses less digits than its factorization.

21111010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21111010000 its reverse (1011112), we get a palindrome (21112021112).

The spelling of 21111010000 in words is "twenty-one billion, one hundred eleven million, ten thousand".