21300001212 has 48 divisors (see below), whose sum is σ = 56943165440. Its totient is φ = 6070375872.

The previous prime is 21300001211. The next prime is 21300001231. The reversal of 21300001212 is 21210000312.

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 (21300001211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286012 + ... + 352707.

Almost surely, 2^21300001212 is an apocalyptic number.

It is an amenable number.

21300001212 is an abundant number, since it is smaller than the sum of its proper divisors (35643164228).

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

21300001212 is a wasteful number, since it uses less digits than its factorization.

21300001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639130 (or 639128 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21300001212 its reverse (21210000312), we get a palindrome (42510001524).

The spelling of 21300001212 in words is "twenty-one billion, three hundred million, one thousand, two hundred twelve".