21326206 has 16 divisors (see below), whose sum is σ = 35002368. Its totient is φ = 9664600.

The previous prime is 21326161. The next prime is 21326213. The reversal of 21326206 is 60262312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7161 + ... + 9691.

It is an arithmetic number, because the mean of its divisors is an integer number (2187648).

Almost surely, 2^21326206 is an apocalyptic number.

21326206 is a deficient number, since it is larger than the sum of its proper divisors (13676162).

21326206 is a wasteful number, since it uses less digits than its factorization.

21326206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2927.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21326206 is about 4618.0305325972. The cubic root of 21326206 is about 277.3136199442.

Adding to 21326206 its reverse (60262312), we get a palindrome (81588518).

It can be divided in two parts, 2132 and 6206, that added together give a palindrome (8338).

The spelling of 21326206 in words is "twenty-one million, three hundred twenty-six thousand, two hundred six".