21013130100 has 72 divisors (see below), whose sum is σ = 60936863680. Its totient is φ = 5590702080.

The previous prime is 21013130077. The next prime is 21013130147. The reversal of 21013130100 is 103131012.

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, 51924 + ... + 211476.

Almost surely, 2^21013130100 is an apocalyptic number.

21013130100 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 21013130100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30468431840).

21013130100 is an abundant number, since it is smaller than the sum of its proper divisors (39923733580).

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

21013130100 is a wasteful number, since it uses less digits than its factorization.

21013130100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160009 (or 160002 counting only the distinct ones).

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

Adding to 21013130100 its reverse (103131012), we get a palindrome (21116261112).

The spelling of 21013130100 in words is "twenty-one billion, thirteen million, one hundred thirty thousand, one hundred".