21420103127 has 2 divisors, whose sum is σ = 21420103128. Its totient is φ = 21420103126.

The previous prime is 21420103057. The next prime is 21420103147. The reversal of 21420103127 is 72130102412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21420103127 - 2¹⁶ = 21420037591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21420103147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710051563 + 10710051564.

It is an arithmetic number, because the mean of its divisors is an integer number (10710051564).

Almost surely, 2^21420103127 is an apocalyptic number.

21420103127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420103127 is an equidigital number, since it uses as much as digits as its factorization.

21420103127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 21420103127 its reverse (72130102412), we get a palindrome (93550205539).

The spelling of 21420103127 in words is "twenty-one billion, four hundred twenty million, one hundred three thousand, one hundred twenty-seven".