21013120103 has 2 divisors, whose sum is σ = 21013120104. Its totient is φ = 21013120102.

The previous prime is 21013120099. The next prime is 21013120123. The reversal of 21013120103 is 30102131012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21013120103 - 2² = 21013120099 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013120123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506560051 + 10506560052.

It is an arithmetic number, because the mean of its divisors is an integer number (10506560052).

Almost surely, 2^21013120103 is an apocalyptic number.

21013120103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013120103 is an equidigital number, since it uses as much as digits as its factorization.

21013120103 is an evil number, because the sum of its binary digits is even.

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

Adding to 21013120103 its reverse (30102131012), we get a palindrome (51115251115).

The spelling of 21013120103 in words is "twenty-one billion, thirteen million, one hundred twenty thousand, one hundred three".