21220103 has 2 divisors, whose sum is σ = 21220104. Its totient is φ = 21220102.

The previous prime is 21220019. The next prime is 21220109. The reversal of 21220103 is 30102212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220103 - 2²⁰ = 20171527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610051 + 10610052.

It is an arithmetic number, because the mean of its divisors is an integer number (10610052).

Almost surely, 2^21220103 is an apocalyptic number.

21220103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220103 is an equidigital number, since it uses as much as digits as its factorization.

21220103 is an evil number, because the sum of its binary digits is even.

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

The square root of 21220103 is about 4606.5283023118. The cubic root of 21220103 is about 276.8529544891.

Adding to 21220103 its reverse (30102212), we get a palindrome (51322315).

The spelling of 21220103 in words is "twenty-one million, two hundred twenty thousand, one hundred three".