21122103 has 16 divisors (see below), whose sum is σ = 28684800. Its totient is φ = 13823040.

The previous prime is 21122099. The next prime is 21122111. The reversal of 21122103 is 30122112.

It is not a de Polignac number, because 21122103 - 2² = 21122099 is a prime.

It is a super-2 number, since 2×21122103² = 892286470285218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122183) 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 15 ways as a sum of consecutive naturals, for example, 63648 + ... + 63978.

It is an arithmetic number, because the mean of its divisors is an integer number (1792800).

Almost surely, 2^21122103 is an apocalyptic number.

21122103 is a deficient number, since it is larger than the sum of its proper divisors (7562697).

21122103 is a wasteful number, since it uses less digits than its factorization.

21122103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662.

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

The square root of 21122103 is about 4595.8789148540. The cubic root of 21122103 is about 276.4261035298.

Adding to 21122103 its reverse (30122112), we get a palindrome (51244215).

Subtracting 21122103 from its reverse (30122112), we obtain a palindrome (9000009).

The spelling of 21122103 in words is "twenty-one million, one hundred twenty-two thousand, one hundred three".