21427103 has 2 divisors, whose sum is σ = 21427104. Its totient is φ = 21427102.

The previous prime is 21427097. The next prime is 21427121. The reversal of 21427103 is 30172412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21427103 - 2⁶ = 21427039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21427183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10713551 + 10713552.

It is an arithmetic number, because the mean of its divisors is an integer number (10713552).

Almost surely, 2^21427103 is an apocalyptic number.

21427103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21427103 is an equidigital number, since it uses as much as digits as its factorization.

21427103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21427103 is about 4628.9418877320. The cubic root of 21427103 is about 277.7502674207.

Adding to 21427103 its reverse (30172412), we get a palindrome (51599515).

The spelling of 21427103 in words is "twenty-one million, four hundred twenty-seven thousand, one hundred three".