21003214 has 4 divisors (see below), whose sum is σ = 31504824. Its totient is φ = 10501606.

The previous prime is 21003179. The next prime is 21003223. The reversal of 21003214 is 41230012.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21003214² = 882269996659592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003194 and 21003203.

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 as a sum of consecutive naturals, namely, 5250802 + ... + 5250805.

It is an arithmetic number, because the mean of its divisors is an integer number (7876206).

Almost surely, 2^21003214 is an apocalyptic number.

21003214 is a deficient number, since it is larger than the sum of its proper divisors (10501610).

21003214 is a wasteful number, since it uses less digits than its factorization.

21003214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501609.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21003214 is about 4582.9263576889. The cubic root of 21003214 is about 275.9064918127.

Adding to 21003214 its reverse (41230012), we get a palindrome (62233226).

The spelling of 21003214 in words is "twenty-one million, three thousand, two hundred fourteen".