21080022 has 16 divisors (see below), whose sum is σ = 42216960. Its totient is φ = 7017192.

The previous prime is 21080021. The next prime is 21080041. The reversal of 21080022 is 22008012.

It is a junction number, because it is equal to n+sod(n) for n = 21079983 and 21080010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21080021) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3603 + ... + 7425.

It is an arithmetic number, because the mean of its divisors is an integer number (2638560).

Almost surely, 2^21080022 is an apocalyptic number.

21080022 is an abundant number, since it is smaller than the sum of its proper divisors (21136938).

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

21080022 is a wasteful number, since it uses less digits than its factorization.

21080022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21080022 is about 4591.2985091366. The cubic root of 21080022 is about 276.2424093790.

Adding to 21080022 its reverse (22008012), we get a palindrome (43088034).

The spelling of 21080022 in words is "twenty-one million, eighty thousand, twenty-two".