21310310100 has 36 divisors (see below), whose sum is σ = 61657831424. Its totient is φ = 5682749280.

The previous prime is 21310310089. The next prime is 21310310107. The reversal of 21310310100 is 101301312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310310107) 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, 35516884 + ... + 35517483.

Almost surely, 2^21310310100 is an apocalyptic number.

21310310100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310310100 is an abundant number, since it is smaller than the sum of its proper divisors (40347521324).

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

21310310100 is a wasteful number, since it uses less digits than its factorization.

21310310100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71034384 (or 71034377 counting only the distinct ones).

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

Adding to 21310310100 its reverse (101301312), we get a palindrome (21411611412).

The spelling of 21310310100 in words is "twenty-one billion, three hundred ten million, three hundred ten thousand, one hundred".