21111210300 has 144 divisors (see below), whose sum is σ = 64789290720. Its totient is φ = 5289123840.

The previous prime is 21111210299. The next prime is 21111210347. The reversal of 21111210300 is 301211112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3143346 + ... + 3150054.

It is an arithmetic number, because the mean of its divisors is an integer number (449925630).

Almost surely, 2^21111210300 is an apocalyptic number.

21111210300 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 21111210300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32394645360).

21111210300 is an abundant number, since it is smaller than the sum of its proper divisors (43678080420).

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

21111210300 is a wasteful number, since it uses less digits than its factorization.

21111210300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7360 (or 7353 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21111210300 its reverse (301211112), we get a palindrome (21412421412).

The spelling of 21111210300 in words is "twenty-one billion, one hundred eleven million, two hundred ten thousand, three hundred".