21300321012 has 24 divisors (see below), whose sum is σ = 51414568800. Its totient is φ = 6855275616.

The previous prime is 21300320989. The next prime is 21300321023. The reversal of 21300321012 is 21012300312.

It is a junction number, because it is equal to n+sod(n) for n = 21300320982 and 21300321000.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 30603562 + ... + 30604257.

It is an arithmetic number, because the mean of its divisors is an integer number (2142273700).

Almost surely, 2^21300321012 is an apocalyptic number.

It is an amenable number.

21300321012 is an abundant number, since it is smaller than the sum of its proper divisors (30114247788).

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

21300321012 is a wasteful number, since it uses less digits than its factorization.

21300321012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61207855 (or 61207853 counting only the distinct ones).

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

Adding to 21300321012 its reverse (21012300312), we get a palindrome (42312621324).

The spelling of 21300321012 in words is "twenty-one billion, three hundred million, three hundred twenty-one thousand, twelve".