21420310103 has 2 divisors, whose sum is σ = 21420310104. Its totient is φ = 21420310102.

The previous prime is 21420310073. The next prime is 21420310129. The reversal of 21420310103 is 30101302412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21420310103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21420310133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710155051 + 10710155052.

It is an arithmetic number, because the mean of its divisors is an integer number (10710155052).

Almost surely, 2^21420310103 is an apocalyptic number.

21420310103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420310103 is an equidigital number, since it uses as much as digits as its factorization.

21420310103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21420310103 its reverse (30101302412), we get a palindrome (51521612515).

The spelling of 21420310103 in words is "twenty-one billion, four hundred twenty million, three hundred ten thousand, one hundred three".