21202210 has 8 divisors (see below), whose sum is σ = 38163996. Its totient is φ = 8480880.

The previous prime is 21202201. The next prime is 21202211. The reversal of 21202210 is 1220212.

It can be written as a sum of positive squares in 2 ways, for example, as 17214201 + 3988009 = 4149^2 + 1997^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2120221 = 21202210 / (2 + 1 + 2 + 0 + 2 + 2 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (21202211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060101 + ... + 1060120.

Almost surely, 2^21202210 is an apocalyptic number.

21202210 is a deficient number, since it is larger than the sum of its proper divisors (16961786).

21202210 is a wasteful number, since it uses less digits than its factorization.

21202210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120228.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21202210 is about 4604.5857576985. The cubic root of 21202210 is about 276.7751175607.

Adding to 21202210 its reverse (1220212), we get a palindrome (22422422).

It can be divided in two parts, 21202 and 210, that added together give a palindrome (21412).

The spelling of 21202210 in words is "twenty-one million, two hundred two thousand, two hundred ten".