21202200 has 72 divisors (see below), whose sum is σ = 71210100. Its totient is φ = 5653440.

The previous prime is 21202199. The next prime is 21202201. The reversal of 21202200 is 220212.

It is an interprime number because it is at equal distance from previous prime (21202199) and next prime (21202201).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202201) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4090 + ... + 7689.

Almost surely, 2^21202200 is an apocalyptic number.

21202200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202200 is an abundant number, since it is smaller than the sum of its proper divisors (50007900).

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

21202200 is a wasteful number, since it uses less digits than its factorization.

21202200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11801 (or 11789 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 21202200 is about 4604.5846718244. The cubic root of 21202200 is about 276.7750740471.

Adding to 21202200 its reverse (220212), we get a palindrome (21422412).

The spelling of 21202200 in words is "twenty-one million, two hundred two thousand, two hundred".