21030122 has 16 divisors (see below), whose sum is σ = 33488640. Its totient is φ = 9870528.

The previous prime is 21030109. The next prime is 21030127. The reversal of 21030122 is 22103012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21030127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20129 + ... + 21147.

It is an arithmetic number, because the mean of its divisors is an integer number (2093040).

Almost surely, 2^21030122 is an apocalyptic number.

21030122 is a deficient number, since it is larger than the sum of its proper divisors (12458518).

21030122 is a wasteful number, since it uses less digits than its factorization.

21030122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645.

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

The square root of 21030122 is about 4585.8610968934. The cubic root of 21030122 is about 276.0242662274.

Adding to 21030122 its reverse (22103012), we get a palindrome (43133134).

It can be divided in two parts, 2103012 and 2, that multiplied together give a palindrome (4206024).

The spelling of 21030122 in words is "twenty-one million, thirty thousand, one hundred twenty-two".