21211006 has 32 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 9660000.

The previous prime is 21210989. The next prime is 21211009. The reversal of 21211006 is 60011212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84381 + ... + 84631.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^21211006 is an apocalyptic number.

21211006 is a deficient number, since it is larger than the sum of its proper divisors (13625474).

21211006 is a wasteful number, since it uses less digits than its factorization.

21211006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21211006 is about 4605.5407934357. The cubic root of 21211006 is about 276.8133868001.

Adding to 21211006 its reverse (60011212), we get a palindrome (81222218).

The spelling of 21211006 in words is "twenty-one million, two hundred eleven thousand, six".