21116210 has 16 divisors (see below), whose sum is σ = 40245336. Its totient is φ = 7949568.

The previous prime is 21116209. The next prime is 21116213. The reversal of 21116210 is 1261112.

It can be written as a sum of positive squares in 4 ways, for example, as 17901361 + 3214849 = 4231^2 + 1793^2 .

It is not an unprimeable number, because it can be changed into a prime (21116213) 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, 61937 + ... + 62276.

Almost surely, 2^21116210 is an apocalyptic number.

21116210 is a deficient number, since it is larger than the sum of its proper divisors (19129126).

21116210 is a wasteful number, since it uses less digits than its factorization.

21116210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124237.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 21116210 is about 4595.2377522822. The cubic root of 21116210 is about 276.4003938022.

Adding to 21116210 its reverse (1261112), we get a palindrome (22377322).

The spelling of 21116210 in words is "twenty-one million, one hundred sixteen thousand, two hundred ten".