21320130123 has 48 divisors (see below), whose sum is σ = 33005772800. Its totient is φ = 13738559040.

The previous prime is 21320130113. The next prime is 21320130179. The reversal of 21320130123 is 32103102312.

21320130123 is a `hidden beast` number, since 21 + 320 + 1 + 301 + 23 = 666.

It is not a de Polignac number, because 21320130123 - 2⁴ = 21320130107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320130096 and 21320130105.

It is not an unprimeable number, because it can be changed into a prime (21320130113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12119718 + ... + 12121476.

Almost surely, 2^21320130123 is an apocalyptic number.

21320130123 is a deficient number, since it is larger than the sum of its proper divisors (11685642677).

21320130123 is a wasteful number, since it uses less digits than its factorization.

21320130123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414 (or 3402 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21320130123 its reverse (32103102312), we get a palindrome (53423232435).

The spelling of 21320130123 in words is "twenty-one billion, three hundred twenty million, one hundred thirty thousand, one hundred twenty-three".