21011330100 has 72 divisors (see below), whose sum is σ = 60855480000. Its totient is φ = 5597242880.

The previous prime is 21011330099. The next prime is 21011330167. The reversal of 21011330100 is 103311012.

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 23 ways as a sum of consecutive naturals, for example, 259276 + ... + 330524.

It is an arithmetic number, because the mean of its divisors is an integer number (845215000).

Almost surely, 2^21011330100 is an apocalyptic number.

21011330100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011330100 is an abundant number, since it is smaller than the sum of its proper divisors (39844149900).

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

21011330100 is a wasteful number, since it uses less digits than its factorization.

21011330100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72249 (or 72242 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21011330100 its reverse (103311012), we get a palindrome (21114641112).

The spelling of 21011330100 in words is "twenty-one billion, eleven million, three hundred thirty thousand, one hundred".