21022130 has 8 divisors (see below), whose sum is σ = 37839852. Its totient is φ = 8408848.

The previous prime is 21022117. The next prime is 21022163. The reversal of 21022130 is 3122012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20675209 + 346921 = 4547^2 + 589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051097 + ... + 1051116.

Almost surely, 2^21022130 is an apocalyptic number.

21022130 is a deficient number, since it is larger than the sum of its proper divisors (16817722).

21022130 is a wasteful number, since it uses less digits than its factorization.

21022130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102220.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21022130 is about 4584.9896401192. The cubic root of 21022130 is about 275.9892963013.

Adding to 21022130 its reverse (3122012), we get a palindrome (24144142).

The spelling of 21022130 in words is "twenty-one million, twenty-two thousand, one hundred thirty".