21103122 has 16 divisors (see below), whose sum is σ = 42460992. Its totient is φ = 6991920.

The previous prime is 21103109. The next prime is 21103123. The reversal of 21103122 is 22130112.

It is a junction number, because it is equal to n+sod(n) for n = 21103098 and 21103107.

It is not an unprimeable number, because it can be changed into a prime (21103123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9529 + ... + 11532.

It is an arithmetic number, because the mean of its divisors is an integer number (2653812).

Almost surely, 2^21103122 is an apocalyptic number.

21103122 is an abundant number, since it is smaller than the sum of its proper divisors (21357870).

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

21103122 is a wasteful number, since it uses less digits than its factorization.

21103122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21233.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21103122 is about 4593.8134485414. The cubic root of 21103122 is about 276.3432769237.

Adding to 21103122 its reverse (22130112), we get a palindrome (43233234).

The spelling of 21103122 in words is "twenty-one million, one hundred three thousand, one hundred twenty-two".