21300012 has 36 divisors (see below), whose sum is σ = 55300336. Its totient is φ = 6907680.

The previous prime is 21299987. The next prime is 21300029. The reversal of 21300012 is 21000312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21300012² = 907381022400288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21299967 and 21300003.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6664 + ... + 9327.

Almost surely, 2^21300012 is an apocalyptic number.

It is an amenable number.

21300012 is an abundant number, since it is smaller than the sum of its proper divisors (34000324).

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

21300012 is a wasteful number, since it uses less digits than its factorization.

21300012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16038 (or 16033 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 21300012 is about 4615.1936037397. The cubic root of 21300012 is about 277.2000362312.

Adding to 21300012 its reverse (21000312), we get a palindrome (42300324).

The spelling of 21300012 in words is "twenty-one million, three hundred thousand, twelve".