21002226 has 32 divisors (see below), whose sum is σ = 48688128. Its totient is φ = 5915280.

The previous prime is 21002213. The next prime is 21002231. The reversal of 21002226 is 62220012.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (1521504).

Almost surely, 2^21002226 is an apocalyptic number.

21002226 is an abundant number, since it is smaller than the sum of its proper divisors (27685902).

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

21002226 is a wasteful number, since it uses less digits than its factorization.

21002226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7126.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21002226 is about 4582.8185650318. The cubic root of 21002226 is about 275.9021654925.

Adding to 21002226 its reverse (62220012), we get a palindrome (83222238).

The spelling of 21002226 in words is "twenty-one million, two thousand, two hundred twenty-six".