21063206 has 16 divisors (see below), whose sum is σ = 32489424. Its totient is φ = 10235904.

The previous prime is 21063199. The next prime is 21063223. The reversal of 21063206 is 60236012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21626 + ... + 22578.

It is an arithmetic number, because the mean of its divisors is an integer number (2030589).

Almost surely, 2^21063206 is an apocalyptic number.

21063206 is a deficient number, since it is larger than the sum of its proper divisors (11426218).

21063206 is a wasteful number, since it uses less digits than its factorization.

21063206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21063206 is about 4589.4668535681. The cubic root of 21063206 is about 276.1689349440.

Adding to 21063206 its reverse (60236012), we get a palindrome (81299218).

The spelling of 21063206 in words is "twenty-one million, sixty-three thousand, two hundred six".