21036214 has 24 divisors (see below), whose sum is σ = 33644520. Its totient is φ = 9860928.

The previous prime is 21036203. The next prime is 21036227. The reversal of 21036214 is 41263012.

It is a junction number, because it is equal to n+sod(n) for n = 21036191 and 21036200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62254 + ... + 62590.

It is an arithmetic number, because the mean of its divisors is an integer number (1401855).

Almost surely, 2^21036214 is an apocalyptic number.

21036214 is a deficient number, since it is larger than the sum of its proper divisors (12608306).

21036214 is a wasteful number, since it uses less digits than its factorization.

21036214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21036214 is about 4586.5252642932. The cubic root of 21036214 is about 276.0509165323.

Adding to 21036214 its reverse (41263012), we get a palindrome (62299226).

The spelling of 21036214 in words is "twenty-one million, thirty-six thousand, two hundred fourteen".