21021014 has 8 divisors (see below), whose sum is σ = 36036048. Its totient is φ = 9009000.

The previous prime is 21021001. The next prime is 21021043. The reversal of 21021014 is 41012012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21020986 and 21021004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750737 + ... + 750764.

It is an arithmetic number, because the mean of its divisors is an integer number (4504506).

Almost surely, 2^21021014 is an apocalyptic number.

21021014 is a deficient number, since it is larger than the sum of its proper divisors (15015034).

21021014 is a wasteful number, since it uses less digits than its factorization.

21021014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501510.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21021014 is about 4584.8679370294. The cubic root of 21021014 is about 275.9844124082.

Adding to 21021014 its reverse (41012012), we get a palindrome (62033026).

The spelling of 21021014 in words is "twenty-one million, twenty-one thousand, fourteen".