21350106 has 12 divisors (see below), whose sum is σ = 46258602. Its totient is φ = 7116696.

The previous prime is 21350093. The next prime is 21350111. The reversal of 21350106 is 60105312.

It can be written as a sum of positive squares in only one way, i.e., 10949481 + 10400625 = 3309^2 + 3225^2 .

It is a super-2 number, since 2×21350106² = 911654052422472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1186117 = 21350106 / (2 + 1 + 3 + 5 + 0 + 1 + 0 + 6).

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 5 ways as a sum of consecutive naturals, for example, 593041 + ... + 593076.

Almost surely, 2^21350106 is an apocalyptic number.

21350106 is an abundant number, since it is smaller than the sum of its proper divisors (24908496).

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

21350106 is a wasteful number, since it uses less digits than its factorization.

21350106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186125 (or 1186122 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 21350106 is about 4620.6174912018. The cubic root of 21350106 is about 277.4171751845.

Adding to 21350106 its reverse (60105312), we get a palindrome (81455418).

The spelling of 21350106 in words is "twenty-one million, three hundred fifty thousand, one hundred six".