21312140103 has 12 divisors (see below), whose sum is σ = 31365037080. Its totient is φ = 13940015856.

The previous prime is 21312140063. The next prime is 21312140123. The reversal of 21312140103 is 30104121312.

It is not a de Polignac number, because 21312140103 - 2²⁹ = 20775269191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312140123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22339293 + ... + 22340246.

It is an arithmetic number, because the mean of its divisors is an integer number (2613753090).

Almost surely, 2^21312140103 is an apocalyptic number.

21312140103 is a deficient number, since it is larger than the sum of its proper divisors (10052896977).

21312140103 is a wasteful number, since it uses less digits than its factorization.

21312140103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44679598 (or 44679595 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21312140103 its reverse (30104121312), we get a palindrome (51416261415).

The spelling of 21312140103 in words is "twenty-one billion, three hundred twelve million, one hundred forty thousand, one hundred three".