21134320424123 has 4 divisors (see below), whose sum is σ = 22053203920848. Its totient is φ = 20215436927400.

The previous prime is 21134320424117. The next prime is 21134320424167. The reversal of 21134320424123 is 32142402343112.

It is a happy number.

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 21134320424123 - 2¹⁸ = 21134320161979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21134320424123.

It is not an unprimeable number, because it can be changed into a prime (21134320424183) 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, 459441748328 + ... + 459441748373.

It is an arithmetic number, because the mean of its divisors is an integer number (5513300980212).

Almost surely, 2^{21134320424123} is an apocalyptic number.

21134320424123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21134320424123 is a deficient number, since it is larger than the sum of its proper divisors (918883496725).

21134320424123 is an equidigital number, since it uses as much as digits as its factorization.

21134320424123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918883496724.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21134320424123 its reverse (32142402343112), we get a palindrome (53276722767235).

The spelling of 21134320424123 in words is "twenty-one trillion, one hundred thirty-four billion, three hundred twenty million, four hundred twenty-four thousand, one hundred twenty-three".