21310210100 has 36 divisors (see below), whose sum is σ = 46266520524. Its totient is φ = 8519777280.

The previous prime is 21310210081. The next prime is 21310210109. The reversal of 21310210100 is 101201312.

It can be written as a sum of positive squares in 6 ways, for example, as 1733723044 + 19576487056 = 41638^2 + 139916^2 .

It is a super-2 number, since 2×21310210100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310210109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148874 + ... + 254526.

Almost surely, 2^21310210100 is an apocalyptic number.

21310210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310210100 is an abundant number, since it is smaller than the sum of its proper divisors (24956310424).

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

21310210100 is a wasteful number, since it uses less digits than its factorization.

21310210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107684 (or 107677 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21310210100 its reverse (101201312), we get a palindrome (21411411412).

The spelling of 21310210100 in words is "twenty-one billion, three hundred ten million, two hundred ten thousand, one hundred".