21312010103 has 2 divisors, whose sum is σ = 21312010104. Its totient is φ = 21312010102.

The previous prime is 21312010099. The next prime is 21312010141. The reversal of 21312010103 is 30101021312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21312010103 - 2² = 21312010099 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312010163) 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, 10656005051 + 10656005052.

It is an arithmetic number, because the mean of its divisors is an integer number (10656005052).

Almost surely, 2^21312010103 is an apocalyptic number.

21312010103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312010103 is an equidigital number, since it uses as much as digits as its factorization.

21312010103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21312010103 its reverse (30101021312), we get a palindrome (51413031415).

The spelling of 21312010103 in words is "twenty-one billion, three hundred twelve million, ten thousand, one hundred three".