21302003123 has 16 divisors (see below), whose sum is σ = 22079609856. Its totient is φ = 20538396480.

The previous prime is 21302003113. The next prime is 21302003131. The reversal of 21302003123 is 32130020312.

It is a cyclic number.

It is not a de Polignac number, because 21302003123 - 2¹² = 21301999027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21302003113) 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, 6649040 + ... + 6652242.

It is an arithmetic number, because the mean of its divisors is an integer number (1379975616).

Almost surely, 2^21302003123 is an apocalyptic number.

21302003123 is a deficient number, since it is larger than the sum of its proper divisors (777606733).

21302003123 is a wasteful number, since it uses less digits than its factorization.

21302003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5314.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21302003123 its reverse (32130020312), we get a palindrome (53432023435).

The spelling of 21302003123 in words is "twenty-one billion, three hundred two million, three thousand, one hundred twenty-three".