21302210 has 16 divisors (see below), whose sum is σ = 38404800. Its totient is φ = 8507376.

The previous prime is 21302191. The next prime is 21302219. The reversal of 21302210 is 1220312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21302191 and 21302200.

It is not an unprimeable number, because it can be changed into a prime (21302219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7121 + ... + 9659.

It is an arithmetic number, because the mean of its divisors is an integer number (2400300).

Almost surely, 2^21302210 is an apocalyptic number.

21302210 is a deficient number, since it is larger than the sum of its proper divisors (17102590).

21302210 is a wasteful number, since it uses less digits than its factorization.

21302210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21302210 is about 4615.4317241186. The cubic root of 21302210 is about 277.2095708850.

Adding to 21302210 its reverse (1220312), we get a palindrome (22522522).

It can be divided in two parts, 21302 and 210, that added together give a palindrome (21512).

The spelling of 21302210 in words is "twenty-one million, three hundred two thousand, two hundred ten".