21310300212 has 48 divisors (see below), whose sum is σ = 52462771200. Its totient is φ = 6713923680.

The previous prime is 21310300199. The next prime is 21310300259. The reversal of 21310300212 is 21200301312.

It is a junction number, because it is equal to n+sod(n) for n = 21310300191 and 21310300200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10162 + ... + 206697.

It is an arithmetic number, because the mean of its divisors is an integer number (1092974400).

Almost surely, 2^21310300212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21310300212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26231385600).

21310300212 is an abundant number, since it is smaller than the sum of its proper divisors (31152470988).

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

21310300212 is a wasteful number, since it uses less digits than its factorization.

21310300212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217316 (or 217314 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21310300212 its reverse (21200301312), we get a palindrome (42510601524).

The spelling of 21310300212 in words is "twenty-one billion, three hundred ten million, three hundred thousand, two hundred twelve".