21442103 has 2 divisors, whose sum is σ = 21442104. Its totient is φ = 21442102.

The previous prime is 21442097. The next prime is 21442133. The reversal of 21442103 is 30124412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21442103 - 2⁴ = 21442087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721051 + 10721052.

It is an arithmetic number, because the mean of its divisors is an integer number (10721052).

Almost surely, 2^21442103 is an apocalyptic number.

21442103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442103 is an equidigital number, since it uses as much as digits as its factorization.

21442103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21442103 is about 4630.5618449601. The cubic root of 21442103 is about 277.8150651397.

Adding to 21442103 its reverse (30124412), we get a palindrome (51566515).

The spelling of 21442103 in words is "twenty-one million, four hundred forty-two thousand, one hundred three".