21102120103 has 8 divisors (see below), whose sum is σ = 21210915168. Its totient is φ = 20993560224.

The previous prime is 21102120101. The next prime is 21102120107. The reversal of 21102120103 is 30102120112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21102120103 - 2¹ = 21102120101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102120101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122550 + ... + 239212.

It is an arithmetic number, because the mean of its divisors is an integer number (2651364396).

Almost surely, 2^21102120103 is an apocalyptic number.

21102120103 is a deficient number, since it is larger than the sum of its proper divisors (108795065).

21102120103 is a wasteful number, since it uses less digits than its factorization.

21102120103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117593.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21102120103 its reverse (30102120112), we get a palindrome (51204240215).

Subtracting 21102120103 from its reverse (30102120112), we obtain a palindrome (9000000009).

The spelling of 21102120103 in words is "twenty-one billion, one hundred two million, one hundred twenty thousand, one hundred three".