21330002003123 has 4 divisors (see below), whose sum is σ = 23269093094328. Its totient is φ = 19390910911920.

The previous prime is 21330002003113. The next prime is 21330002003153. The reversal of 21330002003123 is 32130020003312.

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 21330002003123 - 2¹⁴ = 21330001986739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21330002003095 and 21330002003104.

It is not an unprimeable number, because it can be changed into a prime (21330002003113) 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, 969545545586 + ... + 969545545607.

It is an arithmetic number, because the mean of its divisors is an integer number (5817273273582).

Almost surely, 2^{21330002003123} is an apocalyptic number.

21330002003123 is a deficient number, since it is larger than the sum of its proper divisors (1939091091205).

21330002003123 is a wasteful number, since it uses less digits than its factorization.

21330002003123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939091091204.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21330002003123 its reverse (32130020003312), we get a palindrome (53460022006435).

The spelling of 21330002003123 in words is "twenty-one trillion, three hundred thirty billion, two million, three thousand, one hundred twenty-three".