21134230123 has 4 divisors (see below), whose sum is σ = 21431895408. Its totient is φ = 20836564840.

The previous prime is 21134230097. The next prime is 21134230151. The reversal of 21134230123 is 32103243112.

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 21134230123 - 2¹³ = 21134221931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21134230094 and 21134230103.

It is not an unprimeable number, because it can be changed into a prime (21134230193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148832536 + ... + 148832677.

It is an arithmetic number, because the mean of its divisors is an integer number (5357973852).

Almost surely, 2^21134230123 is an apocalyptic number.

21134230123 is a deficient number, since it is larger than the sum of its proper divisors (297665285).

21134230123 is an equidigital number, since it uses as much as digits as its factorization.

21134230123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297665284.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21134230123 its reverse (32103243112), we get a palindrome (53237473235).

The spelling of 21134230123 in words is "twenty-one billion, one hundred thirty-four million, two hundred thirty thousand, one hundred twenty-three".