21300212 has 24 divisors (see below), whose sum is σ = 38392704. Its totient is φ = 10334912.

The previous prime is 21300203. The next prime is 21300233. The reversal of 21300212 is 21200312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21300193 and 21300202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25343 + ... + 26169.

It is an arithmetic number, because the mean of its divisors is an integer number (1599696).

Almost surely, 2^21300212 is an apocalyptic number.

It is an amenable number.

21300212 is a deficient number, since it is larger than the sum of its proper divisors (17092492).

21300212 is a wasteful number, since it uses less digits than its factorization.

21300212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21300212 is about 4615.2152712523. The cubic root of 21300212 is about 277.2009038337.

Adding to 21300212 its reverse (21200312), we get a palindrome (42500524).

It can be divided in two parts, 21300 and 212, that added together give a palindrome (21512).

The spelling of 21300212 in words is "twenty-one million, three hundred thousand, two hundred twelve".