21310206 has 16 divisors (see below), whose sum is σ = 43995648. Its totient is φ = 6874200.

The previous prime is 21310199. The next prime is 21310207. The reversal of 21310206 is 60201312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310207) 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, 57100 + ... + 57471.

It is an arithmetic number, because the mean of its divisors is an integer number (2749728).

Almost surely, 2^21310206 is an apocalyptic number.

21310206 is an abundant number, since it is smaller than the sum of its proper divisors (22685442).

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

21310206 is a wasteful number, since it uses less digits than its factorization.

21310206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114607.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21310206 is about 4616.2978673392. The cubic root of 21310206 is about 277.2442510184.

Adding to 21310206 its reverse (60201312), we get a palindrome (81511518).

The spelling of 21310206 in words is "twenty-one million, three hundred ten thousand, two hundred six".