21024206 has 16 divisors (see below), whose sum is σ = 38162016. Its totient is φ = 8480256.

The previous prime is 21024197. The next prime is 21024209. The reversal of 21024206 is 60242012.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024209) 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, 43931 + ... + 44406.

It is an arithmetic number, because the mean of its divisors is an integer number (2385126).

Almost surely, 2^21024206 is an apocalyptic number.

21024206 is a deficient number, since it is larger than the sum of its proper divisors (17137810).

21024206 is a wasteful number, since it uses less digits than its factorization.

21024206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88363.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21024206 is about 4585.2160254453. The cubic root of 21024206 is about 275.9983809329.

Adding to 21024206 its reverse (60242012), we get a palindrome (81266218).

The spelling of 21024206 in words is "twenty-one million, twenty-four thousand, two hundred six".