21031300212 has 48 divisors (see below), whose sum is σ = 52861011840. Its totient is φ = 6469561728.

The previous prime is 21031300183. The next prime is 21031300217. The reversal of 21031300212 is 21200313012.

It is a junction number, because it is equal to n+sod(n) for n = 21031300191 and 21031300200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031300217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715518 + ... + 744330.

It is an arithmetic number, because the mean of its divisors is an integer number (1101271080).

Almost surely, 2^21031300212 is an apocalyptic number.

It is an amenable number.

21031300212 is an abundant number, since it is smaller than the sum of its proper divisors (31829711628).

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

21031300212 is a wasteful number, since it uses less digits than its factorization.

21031300212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33512 (or 33510 counting only the distinct ones).

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

Adding to 21031300212 its reverse (21200313012), we get a palindrome (42231613224).

The spelling of 21031300212 in words is "twenty-one billion, thirty-one million, three hundred thousand, two hundred twelve".