21130003123 has 8 divisors (see below), whose sum is σ = 21263382608. Its totient is φ = 20996669664.

The previous prime is 21130003117. The next prime is 21130003187. The reversal of 21130003123 is 32130003112.

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 21130003123 - 2⁵ = 21130003091 is a prime.

It is a super-3 number, since 3×21130003123³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130003097 and 21130003106.

It is not an unprimeable number, because it can be changed into a prime (21130003523) 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, 1701565 + ... + 1713937.

It is an arithmetic number, because the mean of its divisors is an integer number (2657922826).

Almost surely, 2^21130003123 is an apocalyptic number.

21130003123 is a deficient number, since it is larger than the sum of its proper divisors (133379485).

21130003123 is a wasteful number, since it uses less digits than its factorization.

21130003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23013.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21130003123 its reverse (32130003112), we get a palindrome (53260006235).

The spelling of 21130003123 in words is "twenty-one billion, one hundred thirty million, three thousand, one hundred twenty-three".