21335034123 has 20 divisors (see below), whose sum is σ = 34322459248. Its totient is φ = 13129251120.

The previous prime is 21335034113. The next prime is 21335034131. The reversal of 21335034123 is 32143053312.

21335034123 is a `hidden beast` number, since 2 + 1 + 33 + 503 + 4 + 123 = 666.

It is not a de Polignac number, because 21335034123 - 2¹⁶ = 21334968587 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21335034113) 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 19 ways as a sum of consecutive naturals, for example, 10129543 + ... + 10131648.

Almost surely, 2^21335034123 is an apocalyptic number.

21335034123 is a deficient number, since it is larger than the sum of its proper divisors (12987425125).

21335034123 is a wasteful number, since it uses less digits than its factorization.

21335034123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20261216 (or 20261207 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 21335034123 its reverse (32143053312), we get a palindrome (53478087435).

The spelling of 21335034123 in words is "twenty-one billion, three hundred thirty-five million, thirty-four thousand, one hundred twenty-three".