21123002202103 has 4 divisors (see below), whose sum is σ = 21125549298568. Its totient is φ = 21120455105640.

The previous prime is 21123002202097. The next prime is 21123002202119. The reversal of 21123002202103 is 30120220032112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21123002202103 - 2⁹ = 21123002201591 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 (21123002202803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1273535793 + ... + 1273552378.

It is an arithmetic number, because the mean of its divisors is an integer number (5281387324642).

Almost surely, 2^{21123002202103} is an apocalyptic number.

21123002202103 is a deficient number, since it is larger than the sum of its proper divisors (2547096465).

21123002202103 is an equidigital number, since it uses as much as digits as its factorization.

21123002202103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547096464.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21123002202103 its reverse (30120220032112), we get a palindrome (51243222234215).

The spelling of 21123002202103 in words is "twenty-one trillion, one hundred twenty-three billion, two million, two hundred two thousand, one hundred three".