21313020100 has 36 divisors (see below), whose sum is σ = 48683429200. Its totient is φ = 8076512160.

The previous prime is 21313020097. The next prime is 21313020107. The reversal of 21313020100 is 102031312.

It is not an unprimeable number, because it can be changed into a prime (21313020107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5606790 + ... + 5610589.

Almost surely, 2^21313020100 is an apocalyptic number.

21313020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313020100 is an abundant number, since it is smaller than the sum of its proper divisors (27370409100).

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

21313020100 is a wasteful number, since it uses less digits than its factorization.

21313020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11217412 (or 11217405 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21313020100 its reverse (102031312), we get a palindrome (21415051412).

The spelling of 21313020100 in words is "twenty-one billion, three hundred thirteen million, twenty thousand, one hundred".