21308243103 has 16 divisors (see below), whose sum is σ = 36077448960. Its totient is φ = 12176138808.

The previous prime is 21308243083. The next prime is 21308243123. The reversal of 21308243103 is 30134280312.

21308243103 is a `hidden beast` number, since 21 + 308 + 24 + 310 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21308243083) and next prime (21308243123).

It is not a de Polignac number, because 21308243103 - 2¹⁰ = 21308242079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21308243123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56370825 + ... + 56371202.

It is an arithmetic number, because the mean of its divisors is an integer number (2254840560).

Almost surely, 2^21308243103 is an apocalyptic number.

21308243103 is a deficient number, since it is larger than the sum of its proper divisors (14769205857).

21308243103 is a wasteful number, since it uses less digits than its factorization.

21308243103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112742043 (or 112742037 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 21308243103 in words is "twenty-one billion, three hundred eight million, two hundred forty-three thousand, one hundred three".