21123305130 has 16 divisors (see below), whose sum is σ = 50695932384. Its totient is φ = 5632881360.

The previous prime is 21123305117. The next prime is 21123305141. The reversal of 21123305130 is 3150332112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21123305097 and 21123305106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352055056 + ... + 352055115.

It is an arithmetic number, because the mean of its divisors is an integer number (3168495774).

Almost surely, 2^21123305130 is an apocalyptic number.

21123305130 is an abundant number, since it is smaller than the sum of its proper divisors (29572627254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123305130 is a wasteful number, since it uses less digits than its factorization.

21123305130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704110181.

The product of its (nonzero) digits is 540, while the sum is 21.

Adding to 21123305130 its reverse (3150332112), we get a palindrome (24273637242).

The spelling of 21123305130 in words is "twenty-one billion, one hundred twenty-three million, three hundred five thousand, one hundred thirty".