21002214 has 16 divisors (see below), whose sum is σ = 42059952. Its totient is φ = 6991488.

The previous prime is 21002213. The next prime is 21002231. The reversal of 21002214 is 41220012.

21002214 is a modest number, since divided by 2214 gives 210 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002214.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002213) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3882 + ... + 7554.

It is an arithmetic number, because the mean of its divisors is an integer number (2628747).

Almost surely, 2^21002214 is an apocalyptic number.

21002214 is an abundant number, since it is smaller than the sum of its proper divisors (21057738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002214 is a wasteful number, since it uses less digits than its factorization.

21002214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4631.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21002214 is about 4582.8172557936. The cubic root of 21002214 is about 275.9021129452.

Adding to 21002214 its reverse (41220012), we get a palindrome (62222226).

It can be divided in two parts, 2100221 and 4, that added together give a triangular number (2100225 = T₂₀₄₉).

The spelling of 21002214 in words is "twenty-one million, two thousand, two hundred fourteen".